But 65 percent of Democrats expect Clinton will be their party's nominee, while just 27 percent believe it will be Sanders.

After exiting the presidential race in September, Walker called several times for the remaining Republican candidates to clear the field for a positive alternative to Trump.

Asked in December whether he would support Trump should he win the nomination, Walker demurred.

"That’s a long ways off. Votes aren’t going to be cast until the beginning of February," Walker said. "There’s a lot in between now and then. And so if someone’s the nominee, we’ll actually have to assess it at that time."

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