A progressive group threw its support behind three House freshmen who flipped Republican-held seats in last year’s midterms.

Democracy for America (DFA) officially endorsed Reps. Katie Porter (D-Calif.), Mike Levin (D-Calif.) 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 (D-Ill.) Tuesday. All three unseated Republicans in 2018 and are running for their second term.

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DFA cast all three House members as allies of a slate of progressive causes, including expanding health care and combating climate change.

The support comes as progressive groups are intending to flex their muscle in 2020 primaries. DFA has already announced endorsements for progressive stars like Reps. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.), Ilhan Omar Ilhan OmarOmar fires back at Trump over rally remarks: 'This is my country' Trump attacks Omar for criticizing US: 'How did you do where you came from?' Democrats scramble on COVID-19 relief amid division, Trump surprise MORE (D-Minn.), Ayanna Pressley Ayanna PressleyFauci, Black Lives Matter founders included on Time's 100 Most Influential People list Trump attacks Omar for criticizing US: 'How did you do where you came from?' Pressley applauded on House floor after moving speech on living with alopecia MORE (D-Mass.) and Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (D-Mich.).

“In just a few short months, Mike has established himself as a steadfast champion for Medicare for All, the Green New Deal, and the battle against income inequality. He’s governing on the values he ran on and the vision for the future of the country ... that inspired a historic number of Americans to turn out in the 2018 midterm elections,” DFA CEO Yvette Simpson said in a press release announcing the endorsement for Levin.

DFA noted that Porter supports similar policies and that Underwood is the youngest black woman to ever win a seat in Congress.

Of the three new endorsees, Underwood is likely facing the toughest reelection challenge. Though she has yet to attract a Democratic primary challenger, a number of Republicans are looking to take her on in a district that President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE won by nearly 4 points in 2016. Her Illinois district is rated a "toss-up" by Cook Political Report.

Meanwhile, Levin's race is rated "likely Democratic" while Porter's district is rated "lean Democratic."