Santorum thinks it’s time for Romney to face him mano a mano in a debate in order to put the bow on this two-man race, at least two-man as Rick sees it. Newts and Paulies need not apply.

On ABC’s This Week, Santorum slammed Romney as a “weak” candidate and said he wanted to “expose” Romney’s record.

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“I’d love to be able to get one-on-one with Gov. Romney and expose the record that would be the weakest record we could possibly put up against Barack Obama,” said Santorum. “We can’t nominate such a weak candidate.”

Santorum lashed out at Romney for “hiding” behind billionaires and for his similarities to President Obama.

“The more I look at the record of Gov. Romney and match it up against Barack Obama, I feel like I am doing a training run for the general election,” said Santorum. “The same issues I’m out there campaigning on against Gov. Romney are the same issues I’m going to campaign against Barack Obama on.

The polls tend to agree that this is a two-man race, at this point. But delegate-wise, Santorum is still at half of Romney’s haul, at least at this point.

A recent Fox News story claimed that Santorum and Romney look to be splitting the March primaries, further showing that Santorum really has “arrived” in this election as the last non-Romney candidate.

It isn’t likely that Mitt will accept this challenge, though. Since day one Romney’s strategy has been to avoid as much as possible situations where he will be challenged. Mitt doesn’t do media that might challenge him, he was almost always the first to start talking about not doing one debate or another, and he rarely addresses other candidates directly except through his super PACs.

No, my guess is that Rick will have to just battle it out at the polls.