DUBUQUE, Iowa--Rick Santorum disagrees with presidential contender Ron Paul on a lot of issues, but if it came down to a choice between the libertarian-leaning member of Congress and President Barack Obama, Santorum would still vote for Paul on Election Day.

"I'd vote for anybody over Barack Obama," Santorum said after a town hall here when asked specifically if he could vote for Paul. "But I'd have a lot of heartburn on the national security issues with Ron Paul."

Santorum has spent much of the campaign sparring with Paul, the candidate he said he considers the "least likely to win against Barack Obama." But unlike former House Speaker Newt Gingrich, who this week ruled out the possibility of voting for Paul, Santorum would not vote against a Republican nominee in November.

Paul is currently leading in the RealClearPolitics polling average for the Iowa caucuses, which will be held on Tuesday.

Santorum went on to say that a "vast majority of the people would disqualify" Paul as a serious contender if he receives the Republican nomination.

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