Elizabeth Warren to drop out of presidential race

Sen. Elizabeth Warren is suspending her presidential campaign, a source familiar with the decision tells NBC News, a bitter blow for a senator who was long seen by prominent Democrats as headed for the White House.

It is unclear whether Warren will endorse another Democratic candidate for president.

Warren announced her decision on a call with campaign staff Thursday morning in which she expressed disappointment, but thanked them “from the bottom of my heart” for what they were able to accomplish.

“What we have done — and the ideas we have launched into the world, the way we have fought this fight, the relationships we have built — will carry through, carry through for the rest of this election, and the one after that, and the one after that,” Warren said, according to a transcript of the call provided by her campaign.