Sen. Cory Booker Cory Anthony BookerDHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility Black Voters Matter Fund deploying voter outreach caravans in 12 states to drive turnout MORE (D-N.J.) suspended his presidential campaign on Monday, acknowledging that he no longer has the resources to continue his bid for the Democratic nomination.

“It was a difficult decision to make, but I got in this race to win, and I’ve always said I wouldn’t continue if there was no longer a path to victory,” Booker said in an email to supporters.

“Our campaign has reached the point where we need more money to scale up and continue building a campaign that can win — money we don’t have, and money that is harder to raise because I won’t be on the next debate stage and because the urgent business of impeachment will rightly be keeping me in Washington.”

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The announcement brings to an end a campaign that for nearly a year sought to win over voters with a message of love and unity. But that message failed to gain traction among a Democratic electorate eager to confront President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE and his allies.

In a video on Monday, Booker reaffirmed his unity message and vowed to campaign for the eventual Democratic presidential nominee, as well as other candidates down the ballot, though he did not so much as hint at whom he could back in the primary race.

“It is my faith in us — my faith in us together as a nation that we share common pain and common problems that can only be solved with a common purpose and a sense of common cause,” Booker said.

“I can’t wait to get back on the campaign trail and campaign as hard as I can for whoever is the eventual nominee and for candidates up and down the ballot.”

Booker’s decision to end his presidential campaign means that there is only one African American left in the race, former Massachusetts Gov. Deval Patrick Deval PatrickRalph Gants, chief justice of Massachusetts supreme court, dies at 65 It's as if a Trump operative infiltrated the Democratic primary process Top Democratic super PACs team up to boost Biden MORE, who is considered a long shot for the Democratic nomination.

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Booker has expressed concern for months about the waning diversity in the Democratic presidential field, especially as candidates of color, like Sen. Kamala Harris Kamala HarrisScott Walker helping to prep Pence for debate against Harris: report California family frustrated that governor, Harris used fire-damaged property for 'photo opportunity' Moderna releases coronavirus vaccine trial plan as enrollment pushes toward 30,000 MORE (D-Calif.) and former Housing and Urban Development Secretary Julián Castro, dropped out of the race.

A high-profile senator and former mayor of Newark, N.J., Booker launched his campaign in February. But he struggled to break out of low-single digits in the polls and often found his fundraising numbers eclipsed by his top rivals, including Senate colleagues like Elizabeth Warren Elizabeth WarrenWarren, 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 No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) and Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.).

His diminishing position in the primary field became clearer in recent weeks after he failed to qualify for the Democratic presidential debates in December. His decision to end his campaign came after he failed to make the cut for Tuesday's debate in Des Moines.

Booker's campaign first acknowledged in September that it was falling behind in fundraising and urged supporters to donate in order to keep the New Jersey senator in the running.

He raised $6.6 million in the fourth quarter of 2019, putting him well behind most of his competitors for the Democratic nomination.

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By suspending his presidential campaign, Booker frees himself up to focus on other races in 2020, including his own. He’s up for reelection this year, though he remains popular in his home state and is not expected to face a tough path to a second term in the Senate.

He’s also likely to be a valuable surrogate for other Democrats facing tough elections in 2020, and his endorsement will almost certainly be courted by remaining candidates for the party’s presidential nomination.

Updated at 11:45 a.m.