“She has not made any decisions as of this point,” Mr. Sanders said, “and it is important, I think, for all of us — certainly me, who has known Elizabeth Warren for many, many years — to respect the time and the space that she needs to make her decision.”

Appearing on “The Rachel Maddow Show” on MSNBC on Wednesday night, Mr. Sanders praised Ms. Warren, saying she had run “an excellent campaign bringing out a whole lot of ideas, which I think have expanded political consciousness in this country.”

He said it was “too early” to talk about asking her to run for vice president. “But certainly, I have a lot of respect for Senator Warren, and would love to sit down and talk to her about what kind of role she can play in our administration,” Mr. Sanders said.

Maurice Mitchell, the national director of the Working Families Party, which has endorsed Ms. Warren, said he was “pleased” the two senators “are now speaking.”

“They’re both giants of the progressive movement, and we are hopeful that they can figure out how to work together to ensure a progressive nominee and a progressive agenda in Washington,” Mr. Mitchell said.

The results on Tuesday represented a crushing blow to Ms. Warren’s hopes. Last month, Mr. Lau had predicted that she would finish in the top two in eight of the 14 Super Tuesday states, ensuring supporters that, if only they were patient, she still had a path to the nomination regardless of the results in Iowa and New Hampshire.

Now Super Tuesday has come and gone, and Ms. Warren was the only one of the four leading candidates to not score an outright victory — even in Massachusetts, where she fell behind Mr. Biden, who won, and Mr. Sanders.