Manchester, New Hampshire (CNN) Joe Biden is flying to South Carolina on Tuesday night, bailing at the last minute on his planned New Hampshire primary-night party ahead of another expected loss.

Biden told reporters Tuesday in New Hampshire he's leaving because there are "significant portions of the electorate who haven't voted yet."

"We're still mildly hopeful here in New Hampshire," he said. "And we'll see what happens."

Biden's campaign and his allies are urgently attempting to convince Democrats not to write the former vice president off until states with more of the African-American and Latino voters who are crucial to the party's base have had a chance to cast ballots.