Texas · U.S. House · District 37 · November 3, 2026

What it would take for Lauren Peña.

Casar starts 60.9 points ahead on our starting line from recent official results. Campaign work can move about 5,161 net votes toward Peña, a 1.9-point gain. Winning outright would take a 58.9-point national wave on top of that. Here is the plan that makes Peña the one standing if one comes.

162,220

net votes between Peña and a win

days to election day. Early voting opens October 19.

60.9 pts

Casar lead, our starting line from recent results

In short

One-page brief ›All Texas races ranked ›

A long shot on the math: it takes a 58.9-point national wave.

Odds today0%

Odds with the plan0%

Net votes to find162,220

WherePrecinct 201 (Travis County), Precinct 232 (Travis County), Precinct 235 (Travis County)

Underdog UpdateSeptember 26, 2026. Underdog plan published. Starting line: Casar +60.9. Lauren Peña needs 162,220 net votes. Odds 0% today, 0% with the plan.

The number

133,273 votes.

That is half of the 266,545 ballots we expect in this race, plus one. Where Peña stands today, and what is missing:

48,479 Lauren Peña baseline

210,699 Greg Casar baseline

Starting line: a weighted blend of the official 2022 and 2024 results in this district (President, U.S. Senate, Railroad Commissioner, Governor, Attorney General). No 2026 polls have been published. 2026 turnout modeled on 2022, the last midterm.

The odds

0% today. A wave changes that.

We ran this race 20,000 times with realistic error on every assumption. Drag the slider to see the odds move as the campaign captures more of what history says is available.

Peña wins in

of 20,000 simulated elections

With no plan

How much of what history allows the campaign achieves100%

The plan on this page sits at 100%. Median outcome at this setting: Peña short by 156,877.

Each simulation draws the starting line with an error of 7 points of margin (no 2026 polls, so the starting line comes from history and carries more error) and lets the plan over- or under-deliver by 30 percent. Seeded and reproducible; the method and data are at the bottom of the page.

Three moves

The gap closes three ways.

Change minds. Bring out voters who skip midterms. Win back the third-party vote. Every pool below is counted from official precinct returns and published polls.

Persuade

4,679

net votes in the plan, from a pool of 4,679

Who. 4,679 voters who split their ticket in recent elections and lean Casar today.

How. Live conversations on the call list that matters: voters who crossed party lines, plus the undecided. Peña needs to win 50 percent of the ones now leaning Casar.

Mobilize

net votes in the plan, from a pool of 0

Who. There are almost no precincts Peña's side carries, so turnout alone cannot help here.

How. Voter ID calls to people who voted in 2024 and skipped 2022, then a ballot chase until each one has voted.

Consolidate

482

net votes in the plan, from a pool of 1,378

Who. Voters who went third party in recent races, in the precincts that lean Peña's way.

How. A direct appeal to voters who went third party last time. They have already shown they will leave the two-party default.

Together: 5,161 net votes against a gap of 162,220. Still 157,059 short. The rest needs a national shift of about 58.9 points that no campaign controls.

Where it is won

12 precincts carry 17% of it.

Ranked by the net votes each one gives the plan. The darker the county, the more of the upset lives there.

Fewer net votesMore net votes for the upset

01
Precinct 201 (Travis County)persuade
Starting line Casar +33. 9.7% split their ticket.
+132
02
Precinct 232 (Travis County)persuade
Starting line Casar +43. 7.3% split their ticket.
+101
03
Precinct 235 (Travis County)persuade
Starting line Casar +40. 6.6% split their ticket.
+91
04
Precinct 236 (Travis County)persuade
Starting line Casar +44. 6.4% split their ticket.
+86
05
Precinct 233 (Travis County)persuade
Starting line Casar +41. 6.0% split their ticket.
+84
06
Precinct 205 (Travis County)persuade
Starting line Casar +65. 4.9% split their ticket.
+68
07
Precinct 340 (Travis County)persuade
Starting line Casar +44. 5.0% split their ticket.
+67
08
Precinct 238 (Travis County)persuade
Starting line Casar +53. 4.9% split their ticket.
+64
09
Precinct 221 (Travis County)persuade
Starting line Casar +76. 3.7% split their ticket.
+51
10
Precinct 237 (Travis County)persuade
Starting line Casar +53. 5.1% split their ticket.
+51
11
Precinct 207 (Travis County)persuade
Starting line Casar +78. 4.7% split their ticket.
+50
12
Precinct 464 (Travis County)persuade
Starting line Casar +61. 3.7% split their ticket.
+49

What the numbers say that the polls do not

The hidden path.

Precinct 201 (Travis County) carries the most.

Precinct 201 (Travis County) gives this plan more net votes than any other precinct: 132. It sits at Casar +33 on our starting line, and 9.7 percent of its voters split their ticket in recent elections.

Spend it where it counts.

As of June 30, 2026, Casar had $597K in cash on hand to Peña's $770. That is exactly why the plan puts every dollar on the few places listed here instead of the whole map.

The honest math.

Every lever at its historical ceiling moves 5,161 net votes. The gap is 162,220. That is the measure of what a strong campaign adds: 1.9 points of margin, and first position if the national mood breaks.

The evidence

Where voters cross over.

Every dot is a precinct. If no one split a ticket, every dot would sit on the line. The orange ones are where Peña's side lost voters it won further up the ballot.

Precincts: 178
Slope: 0.991
R²: 0.964
Residual SD: 2.2 pts
Crossover precincts: 31

Weighted least squares, one point per precinct, weighted by ballots cast. Orange precincts sit more than one residual standard deviation below the line: Peña's side did worse there in this race than the top of the ticket predicts. Hover any dot for the precinct.

The next 37 days

Voting starts October 19.

Now to October 5
Find them
Voter ID calls across the persuasion list in these precincts. Every conversation tags the voter: with Peña, with Casar, or undecided. The undecided become the persuasion universe; the supporters become the ballot chase list.
October 6 to 18
Persuade
Second conversations with every undecided and soft voter, built around the one issue they named on the first call. The goal is 4,679 net votes from people who have crossed party lines before.
October 19 to 25
Bank the ballots
Mail ballots are already going out, and in-person early voting runs October 19 through October 30. Mail ballot applications must be received by October 23. Chase every supporter's mail ballot request until it is returned, and move supporters to early voting while it is open.
October 26 to November 2
Turn them out
The drop-off voters: people who voted in 2024 and skipped 2022. At least 0 of them live where Peña is favored. In-person early voting ends October 30. Mail ballots count if received by 7 p.m. on November 3, or by 5 p.m. on November 4 if postmarked by Election Day.
November 3
Election day
Polls are open 7 a.m. to 7 p.m. Texas has no same-day registration; the registration deadline is October 5. The last calls go to identified supporters who have not voted, with their polling place in hand.

What has to be true

No wishful thinking.

Official results in this district: Harris carried the 2024 presidential race by 56.5 points; Allred carried the 2024 U.S. Senate race by 60.8 points; O'Rourke carried the 2022 governor's race by 66.0 points.

Peña wins 50 percent of the ticket splitters now leaning Casar.
The national environment moves about 58.9 points toward Peña's side between now and November 3.
No 2026 public poll exists for this race, so the starting line is a weighted blend of official recent results; the first real poll will move it.

The work

1,165 conversations.

That is how many live voter conversations this plan takes: about 22,224 dials to 7,408 households, before the last ballot is cast.

7,408

households on the target list

22K

dials across three attempts

1,165

live conversations: persuasion, voter ID, ballot chase

Call list: every ticket splitter and undecided voter in the targeted places (you cannot tell which way they lean before the call), every targeted drop-off voter, and the reachable third-party voters. About 69 households for every 100 voters on the list, three attempts each, and a 5.24 percent live answer rate per attempt, the per-program average across 1.2 million real 2026 dials in our published benchmarks.

HyperPhonebank

We run this list.

Calls are the voter ID and ballot chase engine of this plan. They find the persuadable voters and the supporters, so every other dollar lands on the right door. The full call program for this list is an estimated $3,858 at our published rates: 7,408 households, three attempts each.

Professional live callers working exactly these precincts: persuasion on the ticket splitters, voter ID on the fence, ballot chase on every absentee request until it is returned. A live dashboard shows every conversation as it happens. Days to launch, not weeks.

Run this plan How HyperPhonebank works ›Size your own program ›

The candidates

Who is on the ballot.

Underdog

Lauren Peña (R)

Paralegal with experience in medical device sales and a bachelor's degree in political science who has served on Austin's Public Safety Commission and Community Police Review Commission.

Cash on hand $770 and $117,890 raised since January 1, 2025, per FEC reports through June 30, 2026.

Campaign site ›FEC filings ›

Favorite · incumbent

Greg Casar (D)

U.S. representative since 2023 and chair of the Congressional Progressive Caucus; a former labor organizer who served on the Austin City Council from 2015 to 2022.

Cash on hand $597,005 and $1,172,881 raised since January 1, 2025, per FEC reports through June 30, 2026.

Campaign site ›FEC filings ›Wikipedia ›

Underdog Updates

What changed, and when.

We re-run this race as new polls, fundraising reports and early vote counts arrive. Every change to the numbers is logged here.

September 26, 2026
Underdog plan published
Starting line: Casar +60.9. Lauren Peña needs 162,220 net votes. Odds 0% today, 0% with the plan.

Questions

Can Lauren Peña win Texas's 37th Congressional District in 2026?

Only with help from the national environment. Campaign work can move about 5,161 net votes; the gap is 162,220. The rest would take a 58.9-point national shift.

Where are the votes Lauren Peña needs?

Ranked by net votes in the plan: Precinct 201 (Travis County), Precinct 232 (Travis County), Precinct 235 (Travis County), Precinct 236 (Travis County), Precinct 233 (Travis County). Persuadable voters are counted from ticket splitting in 2022 and 2024 official returns; turnout targets are people who voted in 2024 and skipped 2022.

How many voters does Lauren Peña need to persuade?

About 2,340 voters who lean Greg Casar today, each worth two votes of margin when they switch. That is 50 percent of the 4,679 persuadable voters leaning Greg Casar.

When does early voting start in Texas in 2026?

In-person early voting in Texas runs October 19 through October 30, 2026. The voter registration deadline is October 5, and applications for a mail ballot must be received by October 23. Mail ballots count if received by 7 p.m. on Election Day, or by 5 p.m. the next day if postmarked by Election Day. Texas does not offer same-day registration.

Who made this analysis?

The Political Group, an independent campaign services firm, from official Texas Secretary of State precinct returns, Census data, FEC filings and published polls. It is not affiliated with any candidate or party.

Method and sources

Precinct math from official Texas Secretary of State returns for 2022 and 2024, projected onto current district lines. Polls, ratings and fundraising as published on the dates shown. This is independent analysis by The Political Group, as of September 26, 2026. It is not affiliated with or endorsed by any candidate or party, and it is written for every campaign that starts behind.

Statistics: a weighted least squares crossover regression on every precinct, and 20,000 seeded Monte Carlo simulations. The baseline error (7 points of margin) and plan efficacy spread (30 percent) are our stated assumptions. Download the precinct data (CSV, ready for JASP). Free to cite under CC BY 4.0 with a link to this page.