"If Barack Obama wants Hillary Clinton out of this race, beat her. Beat her in West Virginia, beat her in Puerto Rico, beat her in Kentucky," Wolfson said, citing other upcoming contests.
Clinton's campaign chairman, Terry McAuliffe, acknowledged Sunday that it was unlikely Clinton would be able to overtake Obama's lead among pledged delegates.
But at the end of the primary season, he predicted, more people will have voted for Clinton than Obama -- if the disputed primaries in Florida and Michigan are counted.
"I believe we will be ahead in the popular vote," McAuliffe said on NBC's "Meet the Press."
Obama gained support from another superdelegate Sunday, Crystal Strait, 28, of Sacramento, a leader in Young Democrats of America. Over the weekend he surpassed Clinton in pledges from such party leaders and elected officials.
Strait said in an interview that she had been leaning toward Clinton, "an inspirational figure," but opted for Obama because of the support he had garnered among young voters.
Strait also approved of Obama's plan to undertake a 50-state voter registration drive.
"Clearly the Obama campaign is committed to rebuilding the Democratic Party," said Strait, who called her endorsement "the hardest decision of my life."
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noam.levey@latimes.com
Times staff writer Dan Morain in Sacramento contributed to this report.
