Former Housing and Urban Development Secretary and Texas native Julián Castro has endorsed Jessica Cisneros, who's challenging Rep. Henry Cuellar (D-Texas) in a Democratic primary.

“The people of South Texas deserve a homegrown champion for hardworking families, good paying jobs, better health care, and immigrants’ rights,” Castro said in a statement Friday. “I’m proud to endorse Jessica Cisneros because she will put the people of South Texas first, not special interests or Washington politics.”

Castro, the former mayor of San Antonio who dropped out of the presidential race in January and threw his support to Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.), marks Cisneros’s first big-name endorsement from an in-state Democrat.

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Castro’s twin brother, Rep. Joaquin Castro Joaquin CastroHispanic Caucus members embark on 'virtual bus tour' with Biden campaign Hispanic caucus report takes stock of accomplishments with eye toward 2021 Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE, is chairman of the Congressional Hispanic Caucus, though Texas Democrats in Congress have stayed relatively silent on the race.

Cisneros, a 26-year-old immigration attorney, has criticized Cuellar for taking corporate PAC money from the fossil fuel industry and private prison groups that run detention camps in his district.

"As mayor of San Antonio, as housing secretary, and throughout his career, Secretary Castro has shown us how to talk about and localize major issues, and I am so grateful for his role in elevating immigration policy on the presidential debate stage," she said in a statement.

The Cuellar campaign has dismissed Cisneros, who is backed by the progressive group Justice Democrats, as an outsider who is out of touch with the district.

Cuellar's team said Friday that the Castro endorsement won't budge the polls.

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“They're my friend, as is his brother, they're both former clients,” Cuellar campaign manager Colin Strother told The Hill, though he added that “if you look at how Julián was polling in Texas, one could argue no one recognized his name."

Strother ripped Castro over the phrasing of his endorsement, saying, "he has an awful political instinct and a solid record of backing losers."

"He could’ve said ‘Oh, I think we need more Latinas in politics, I think we need term limits.’ But to personally attack Henry, it’s a really baseless, classless thing to say, and I’m shocked. Maybe national politics has changed him and he’s not the guy I’ve known for 20 years. … Now he’s created enemies where he’s had friends before," he said.

Cuellar enjoys the backing of Democratic House leaders including Speaker Nancy Pelosi Nancy PelosiPelosi: Ginsburg successor must uphold commitment to 'equality, opportunity and justice for all' Bipartisan praise pours in after Ginsburg's death Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (Calif.) and Democratic Congressional Campaign Committee Chairwoman Cheri Bustos Cheryl (Cheri) Lea BustosThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally DCCC dropping million on voter education program Clark rolls out endorsements in assistant Speaker race MORE (Ill.). He’s also endorsed by more than 225 local elected officials and the San Antonio Express-News.

Cisneros, meanwhile, has been endorsed by several Progressive Caucus members, including Rep. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezLawmakers fear voter backlash over failure to reach COVID-19 relief deal Why Democrats must confront extreme left wing incitement to violence The Hill Interview: Jerry Brown on climate disasters, COVID-19 and Biden's 'Rooseveltian moment' MORE (D-N.Y.). And last week, the Texas chapter of the AFL-CIO endorsed her as well.

Federal Election Commission (FEC) filings show that in the fourth quarter of 2019, Cisneros out-raised Cuellar, $517,000 compared to his $431,000, though the incumbent had $2.9 million cash-on-hand compared to her $615,000.

The Texas primary takes place March 3, Super Tuesday.