WARWICK, R.I. - For the second time in as many days, Mitt Romney was quizzed about his potential vice presidential pick during a town hall and declined to rule out a possible Romney-Santorum ticket.

"Everybody is on my list," said Romney in answer to a voter who asked whether he would consider former presidential candidate Rick Santorum as his running mate. "Everybody is on my list. I'm not taking anybody off the list, alright?"

But Romney quickly stopped himself - backtracking to say that there actually isn't a list of potential vice presidential candidates. At least not yet.

"I actually don't, I don't have a list, yet," said Romney. "So I can't say someone is on or off my list."

"But I can tell you that the people who I had the privilege of running against would surely be among those I would consider," said Romney. "The criteria, I think, has to be, first and foremost, is this a person who could be president of the United States, if that were needed? And do people recognize that and see that as a person who has that kind of qualification and so he- I've said this before. If any of the people I ran against happened to become the nominee, I would have endorsed them and supported them for president."

"So of course they'd be on that list - and he, among others," Romney said of Santorum.

"If any of you have any other ideas, just pass them along here," Romney added, laughing, before searching the room for another questioner.