Giuliani: Romney's flip-flops "give me pause"

Former New York City Mayor and 2008 Republican presidential candidate Rudolph Giuliani refused to offer an endorsement of anyone in the current Republican field on CBS News' "Face the Nation," but he had harsh words for former Mass. Governor Mitt Romney.

Giuliani told host Bob Schieffer that he's "not yet" prepared to endorse the current front-runner, but that Romney's flip-flopping on positions concerns him.

"I'd be inclined to support someone like Mitt Romney, but all those changes in positions give me pause," Giuliani told Schieffer.

Giuliani, who called himself a moderate Republican because he supports gay rights and is pro-choice, said Romney used to be a moderate Republican but has "changed his position virtually on everything.

"He was a traditional moderate Republican, strong on fiscal matters, conservative, strong on foreign policy, but basically socially moderate," Giuliani said from Indianapolis. "He changed all that. I am a moderate Republican. That's what I am. So I'd be inclined to support someone like Mitt Romney. But all those changes in positions give me pause."

Giuliani said that's why voters are struggling to support Romney, despite his decisive wins in Florida and Nevada.

"I think that's the big issue with Governor Romney. I think that's the reason why he's having a hard time getting to that 50, 51, 52, 53 percent" approval rating in polling, Giuliani said.

Giuliani offered some praise for former House Speaker Newt Gingrich. "Newt is much more willing to make dramatic changes in the way government operates," Giuliani said.

Giuliani also suggested that there is only room for "one conservative candidate" in the Republican field.

"If Rick Santorum and Newt Gingrich could agree somehow, toss a coin or have a good discussion, I think it would be a much more interesting race," Giuliani told Schieffer.

Schieffer asked Giuliani if he regretted not jumping into the presidential race this time around, and he responded that the current mood of the country wouldn't support him.

"If Mitt Romney, having changed all those positions, isn't conservative enough yet, believe me, I wouldn't have had a chance," Giuliani said. "I'm realistic enough to know how Iowa, New Hampshire, South Carolina, Florida, how they would vote. They would like me on economics. They would like me on national security but they wouldn't like me on my social views and I'm not about to change them. They are very much with me."