Okay, I'm a Newt all the way to Tampa supporter. But, to be fair to Santorum, all we have is this quote according to NBC News. This would be such a crazy thing for a candidate to say that I'll wait for a more reliable source.
I looked for a video, but it's a little early yet. But the romney camp did respond, so they took it for fact, and may have their own sources (though they've never been stuck on truth, I know):
"I am in this race to defeat Barack Obama and restore America's promise. I was disappointed to hear that Rick Santorum would rather have Barack Obama as president than a Republican. This election is more important than any one person. It is about the future of America. Any of the Republicans running would be better than President Obama and his record of failure."