Democratic presidential contender Sen. Cory Booker Cory Anthony BookerThe movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (D-N.J.) endorsed Rep. Daniel Lipinski Daniel William LipinskiFive things we learned from this year's primaries Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Bottom line MORE's (D-Ill.) primary challenger, Marie Newman, on Thursday, saying it was time for "new leadership" in the Illinois district.

Booker cited Newman's stances on health care, women's reproductive rights and LGBTQ rights as his reasons for throwing his support behind Newman.

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“That is why I believe it is time for new leadership in Illinois’ Third District from a candidate who shares our party’s values," Booker said in a statement. "I am proud to support Marie, who will be a champion for equality and justice for the families of her district. I look forward to campaigning with and for her tomorrow and in the coming months.”

The senator's campaign announced that Booker will join Newman at a campaign event in Chicago on Friday.

Lipinski is seen as a Blue Dog Democrat who liberals say is too conservative for the party. The congressman voted against the Affordable Care Act and has voiced opposition to abortion.

Liberals have, in turn, flocked to Newman as their preferred choice to represent Illinois's 3rd Congressional District, which includes parts of Cook County. The district was previously represented by his father, former Rep. Bill Lipinski (D-Ill.).

Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), who is also running for president, and Rep. 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.) endorsed Newman last month.