Rep. Greg Casar, the 35-year-old chair of the Congressional Progressive Caucus, is gearing up for a March 2026 primary in a district that didn’t exist a year ago. The Texas 37th Congressional District was born out of a contentious mid-decade redistricting engineered by Texas Republicans and signed into law on August 29, 2025. The new maps sliced apart Casar’s current TX-35 seat — removing more than 90 percent of his constituents — and packed Austin’s liberal voters into a single, deep-blue district.

Casar filed for re-election in the new 37th after veteran Rep. Lloyd Doggett announced he would not run. That cleared the biggest obstacle. Now the question is whether anyone — or any donor coalition — can mount a credible challenge in the Greg Casar primary.

Greg Casar 2026: The Money Advantage

According to Federal Election Commission filings, Casar has raised $893,978 for the 2026 cycle. Of that, $685,028 came from individual contributions and $185,530 from political action committees. He has spent roughly $604,158 and has an estimated $290,000 in cash on hand.

No other candidate in the TX-37 Democratic primary has reported fundraising figures significant enough to appear prominently in FEC search results. Quiver Quantitative estimates approximately $1.24 million in total spending connected to the race, and rates it Solid D.

The FEC’s TX-37 election page notes it only displays candidates who have registered and filed financial reports. As of available data, Casar is the only candidate with a substantial war chest.

Who’s Writing the Checks

Casar’s donor base reveals organized labor is all in.

His top PAC contributors at the $5,000 maximum include:

  • UNITE HERE TIP Campaign Committee (hospitality workers union)
  • SEIU COPE (Service Employees International Union)
  • American Federation of Teachers, AFL-CIO COPE
  • American Federation of Government Employees PAC
  • Carpenters Legislative Improvement Committee
  • International Association of Sheet Metal, Air, Rail and Transportation Workers
  • Machinists Non Partisan Political League
  • Jane Fonda Climate PAC

On the individual donor side, Casar draws heavily from wealthy progressive donors in California and Texas, many contributing at or near the $3,500 individual maximum. Names include Quinn Delaney (CA), George Marcus (CA), Steve Phillips (CA), and multiple Texas-based donors.

What stands out: very few small-dollar contributions appear in the itemized data. The bulk of Casar’s individual fundraising comes from large donors, not the grassroots small-dollar army one might expect from a Sanders-aligned progressive. His OpenSecrets profile shows top contributing sectors that include labor unions, lawyers and law firms, and progressive advocacy organizations.

Greg Casar Background: From City Hall to the Capitol

Understanding who funds Casar requires understanding what he represents.

Born in Houston to Mexican immigrant parents, Casar became the youngest person ever elected to the Austin City Council in 2014 at age 25. He built his reputation on progressive causes — loosening public camping laws, cutting the Austin police budget in 2020, and championing workers’ rights. Those positions drew national attention and fierce local backlash. Republican Gov. Greg Abbott overrode both the camping and policing policies at the state level.

Despite those controversies, Casar won his 2022 congressional primary with 61 percent of the vote and took the general election 73 percent to 27 percent. He earned endorsements from Sen. Bernie Sanders, Sen. Elizabeth Warren, and Rep. Alexandria Ocasio-Cortez.

In Washington, he serves as Vice Ranking Member on the House Education and the Workforce Committee and sits on the House Oversight and Government Reform Committee. His legislative focus has centered on workplace heat protections, Medicare for All, immigration reform, and gun violence prevention. He has introduced 10 bills, though none have been enacted.

His most visible act of advocacy: a Thirst Strike for Workers’ Rights, spending a day without food or water on the Capitol steps to protest the elimination of mandatory water breaks for Texas construction workers.

What the Texas 2026 Election District Wants

The new TX-37 is not the same electorate that first sent Casar to Congress.

His old TX-35 was a coalition district — a narrow corridor connecting minority communities in Austin and San Antonio with a heavily Hispanic and Black population. The new 37th is centered squarely within Austin’s city limits, meaning the primary electorate will skew toward white, college-educated, liberal professionals rather than the working-class Latino base Casar built his career around.

Austin is one of the most educated metro areas in Texas, home to the University of Texas and a booming tech sector. Housing affordability is arguably the dominant local concern, cutting across racial and class lines. The TIME analysis of the new maps found that Texas Republicans systematically cracked Latino and Black neighborhoods, ensuring "white voting blocs remain decisive — even inside districts labeled ‘Latino.’"

Democrats have won the Austin-area seat by 45-plus points in each of the last three cycles. The real contest is the primary, not November.

The Lobbying Gap

One notable absence in Casar’s financial picture: lobbying connections are thin. No lobbying disclosures were found tied to his sponsored legislation, and the PAC contributions flowing to his campaign come overwhelmingly from labor unions and progressive advocacy groups rather than corporate lobbying interests.

This tracks with his political brand. Casar chairs the Congressional Progressive Caucus and has made "fighting oligarchy" a centerpiece of his messaging — including a national tour with Sanders and Ocasio-Cortez. Corporate PAC money would undercut that narrative.

The Wilderness Society Action Fund PAC, which lobbied on conservation legislation in prior congresses, has contributed to dozens of Democratic members — though its direct contributions to Casar specifically were not itemized in the available data.

Greg Casar 2026: What’s at Stake

The broader context matters as much as the district. Texas’s mid-decade redistricting is part of a nationwide wave of map-drawing ahead of the 2026 midterms. The U.S. Supreme Court allowed the new Texas maps to stand in December 2025, potentially handing Republicans up to five additional House seats, according to NPR.

For Casar, the TX-37 seat is both a refuge and a launchpad. He’s the progressive movement’s chosen vehicle in Texas, backed by nearly $900,000 in campaign funds, the institutional weight of organized labor, and endorsements from the party’s most prominent progressive voices.

No challenger has emerged with the financial resources or political infrastructure to seriously contest the primary. Unless that changes before March 3, 2026, the money has already decided this race.