Two months before voting begins in the 2016 presidential primaries, Sen. Elizabeth Warren remains the only female Democratic senator not to have endorsed Hillary Clinton.

Clinton held an event Monday evening inside a Capitol Hill hotel with 13 of the Senate's 14 female Democrats, making Warren's absence particularly glaring.



Every one of the women in attendance had previously endorsed Clinton in some capacity except Sen. Maria Cantwell of Washington, whose spokesperson told U.S. News in October she was still a holdout. But with Cantwell coming on board, the assembly was meant to convey a powerful show of unity around Clinton, a former senator from New York and the former secretary of state. "We're going to be there for Hillary, we're going to get the vote out," said Cantwell.

Clinton now boasts endorsements from 38 of the 46 Senate Democratic members, or 83 percent of the caucus, according to The Chase, U.S. News' political tracker.

Sen. Bernie Sanders, the Vermont independent who caucuses with Democrats, has not landed a single endorsement from a colleague. No Republican candidate has more than three Senate endorsements.

But Sanders' campaign was eager to note that he remains in constant contact with Warren, although representatives stressed the conversations centered around Senate business, not the White House campaign.



"He's known her and admired her since she was a mere Harvard professor. They speak all the time," says Sanders' spokesman Michael Briggs.

Warren has delicately danced around questions revolving Clinton, publicly praising Sanders for fighting for what he believes in while steering clear of direct criticism of the front-runner. Conversely, the Clintons have long eyed Warren as a political threat. Former President Bill Clinton reportedly declined to campaign for Warren's election to the Senate in 2012.



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