Three House Democrats who flipped seats in the midterm elections announced Sunday they are backing former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE in the 2020 election.

Reps. Conor Lamb (D-Pa.), Elaine Luria Elaine Goodman LuriaUS Chamber of Commerce set to endorse 23 House freshman Democrats House panel votes against curtailing Insurrection Act powers after heated debate Republican Scott Taylor wins Virginia primary, to face Elaine Luria in rematch MORE (D-Va.) and Chrissy Houlahan (D-Pa.) endorsed Biden, calling him the best candidate to take on President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE and unite a divided country.

The endorsements come as Biden tries to make the case that he's the best candidate to win in areas that Trump carried in 2016.

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“I believe that the next President must attempt to unify this country,” Lamb said in a statement. “President Trump has only driven people further apart. Joe Biden has promised to try, above all, to bring people together, and that’s why I support him to become the next President of the United States.”

Lamb first won a tough special election in early 2018 after Rep. Tim Murphy Tim MurphyBiden receives endorsements from three swing-district Democrats A federal abortion law might be needed Female Dems see double standard in Klobuchar accusations MORE (R-Pa.) resigned, and Lamb later unseated a Republican incumbent in the fall in a different district after court-ordered redistricting.

Houlahan and Luria both flipped Republican-held seats in the 2018 when Democrats took back the House majority.

“Joe Biden is ‘battle-tested’ on the world stage, in Congress, and in the White House. He will defeat Donald Trump and win in tough districts like mine,” Luria said in a statement.

“Our country needs a steady hand, someone who can help heal the country, an experienced and proven leader who can build teams with deep expertise and work across the aisle,” Houlahan said in a statement. “We need a leader who will restore American leadership, revive our alliances, and defend democratic values around the world. Joe Biden is that leader.”

The endorsements follow Biden’s backing from Iowa Rep. Abby Finkenauer Abby Lea FinkenauerHouse Democrats' campaign arm reserves .6M in ads in competitive districts GOP leader says he doesn't want Chamber's endorsement: 'They have sold out' US Chamber of Commerce set to endorse 23 House freshman Democrats MORE (D), another lawmaker who flipped a GOP seat in 2018. Finkenauer became the first congressional representative from Iowa to back Biden when she endorsed him last week.