won South Carolina's primary, on stage in Dallas to endorse him.

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Pete Buttigieg, the former mayor of South Bend, Indiana, dropped out of the race Sunday night and endorsed Biden in Dallas on Monday evening, as did former Rep. Beto O'Rourke of Texas, who suspended his campaign last year.

"I don't look at the mayor and Beto O'Rourke and myself as establishment. I look at us as new leaders for the party, fresh faces for the party. And we're basically saying, 'We've got to win here, and that's why we're supporting Joe Biden,'" Klobuchar said Tuesday.

Asked to react to President Donald Trump's impression that she and other Democrats were stagingeffort" to stop him from securing the nomination, saying members of the political establishment are "really getting nervous."

NBC News reported Monday that former President Barack Obama may be the quiet hand behind the movement of Democrats coalescing around Biden.

Obama spoke with his former vice president after he handily won South Carolina on Saturday and with Buttigieg on Sunday when he dropped out of the race, according to people familiar with the calls.

People close to Obama said he has been keeping close tabs on the race. They said that the signal has been sent in the past 36 hours that he sees Biden as the candidate to back and that they don't need Obama to say it publicly or privately.