Former Democratic presidential candidate Julián Castro filed paperwork with the Federal Election Commission (FEC) announcing the formation of a PAC.

The paperwork, which the FEC website shows was signed Wednesday, indicated that the People First Future PAC has donated to five Democrats: Reps. 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 (Texas) and Lauren Underwood Lauren UnderwoodObama announces first wave of 2020 endorsements The Hill's Coronavirus Report: GoDaddy CEO Aman Bhutani says DC policymakers need to do more to support ventures and 'solo-preneurs'; Federal unemployment benefits expire as coronavirus deal-making deadlocks The Hill's Coronavirus Report: iBIO Chairman and CEO Thomas Isett says developing a safe vaccine is paramount; US surpasses 150,000 coronavirus deaths with roughy one death per minute MORE (Ill.) and House challengers Marie Newman (Ill.), J.D. Scholten (Iowa) and Wendy Davis (Texas).

Underwood, a first-term lawmaker who flipped a Republican district in 2018, is running for reelection in a tight race after winning her seat by 5 points two years ago.

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Meanwhile all three Democratic challengers are running in high-profile races. Newman is waging a primary fight against Rep. Dan Lipinski (D), who has earned the ire of progressives over his opposition to abortion access and past comments on the LGBTQ community.

Scholten is running against Rep. Steve King Steven (Steve) Arnold KingGOP leader: 'There is no place for QAnon in the Republican Party' Loomer win creates bigger problem for House GOP Win by QAnon believer creates new headaches for House GOP MORE (R), a top Democratic target who has been hammered for comments praising white nationalism, and Davis is challenging Rep. Chip RoyCharles (Chip) Eugene RoyPelosi must go — the House is in dire need of new leadership GOP lawmakers want answers from Disney on Mulan, China Freedom Caucus member Chip Roy touts bipartisanship in first campaign ad MORE (R), who won his seat by fewer than 3 points in 2018.

Castro’s PAC is an outgrowth of his failed White House campaign. The former Housing and Urban Development secretary and former San Antonio mayor dropped out of the race in January amid dwindling poll numbers. He later endorsed Sen. Elizabeth Warren Elizabeth WarrenGOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (D-Mass.), who dropped out earlier this month.