But if 2008 is any indication, nearly all of them will.
On May 6, 2008, Alexander Mooney reported at CNN:
According to the exit polls, half of Clinton's supporters in Indiana would not vote for Obama in a general election match up with John McCain. A third of Clinton voters said they would pick McCain over Obama, while 17 percent said they would not vote at all. Just 48 percent of Clinton supporters said they would back Obama in November.
Obama gets even less support from Clinton backers in North Carolina. There, only 45 percent of Clinton supporters said they would vote for Obama over McCain. Thirty-eight percent said they would vote for McCain while 12 percent said they would not vote.
Obama voters appear to be more willing to support Clinton in November. In Indiana, 59 percent of Obama backers said they'd vote for Clinton, and 70 percent of Obama backers in North Carolina said they'd support the New York Democrat.In Indiana, 88 percent of Democrats voted for Obama.
In North Carolina, 90 percent of Democrats voted for Obama.
Both figures were close to the national figure of 89 percent.
