Rick Santorum Takes on Mitt Romney in Michigan

Republican candidates square off in yet another GOP debate.
1:33 | 02/22/12

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Transcript for Rick Santorum Takes on Mitt Romney in Michigan
Every Republican candidate. Is taking the pulse of the economy all day today including gas prices as tonight they head into their twentieth yes they're twentieth debate. It's your voice your vote and the more the Republicans brawl. The happier one candidate jets who isn't. Here's ABC's Jon Karl. Output is the president doing these days -- Look at him with Mick Jagger last night at the White House. Singing the blues but feeling just fine after all the heat right now is on the republicans'. Especially Mitt Romney. Facing his biggest test yet. Can he avoid is embarrassing defeat to Rick Santorum Tuesday in Michigan. It's not just -- many Republican voters aren't happy with any of the candidates. In a new AP poll today 40% of Republicans said they are dissatisfied. With the field. Former Republican Party chairman Haley Barbour tells ABC -- we could see the battle for the nomination go all the way to the Republican Convention. If the Republican primary voters continue to split up their most. In such a way that nobody is close. To have and a majority. Then there is a chance. That somebody else might giving you. Barbour says that's -- likely bought a hotly contested convention is necessarily about it. New Jersey governor Chris Christie supports Romney but still some Republicans need to get in. Politico reported that some are privately asking you still. To think about getting back in the race is true yes. What are they saying it that -- -- say things have always have before what I -- -- -- -- is of supporting Mitt Romney -- if Romney loses in Michigan Diane you're gonna hear more calls for a new candidate.

This transcript has been automatically generated and may not be 100% accurate.

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