Iowa Caucus: Rick Santorum the Dark Horse

GOP contender looks to pull an upset with Iowa voters.
4:35 | 01/03/12

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Transcript for Iowa Caucus: Rick Santorum the Dark Horse
-- sea to shining sea the presidential election of 2012 and first stop as always the voters of Iowa streaming tonight. And to more than 17100. Locations living rooms church's general stores Barnes. All to cast their votes for the Republicans will run against president Barack Obama. -- six contenders in Iowa or out in force today shaking that one last hand making their case to voters for the very last time so. Will former governor Mitt Romney with his razor thin lead sealed the deal. Will former senator Rick Santorum turned his late surge into a surprise win ten congressman Ron Paul harness the power of his young voters tonight. And what about the underdogs will Newt Gingrich recover from his twenty point nosedive in twenty days is this the last stand for Rick Perry Michelle -- -- ABC news has been on the ground in Iowa for months crisscrossing the state and we Begin now -- Jake Tapper. Who spent the day with the red dot dark course Rick Santorum hoping to pull off a big upset tonight Jake. He is hoping to do that all eyes are on the former Pennsylvania senator Rick Santorum he has. The big -- he is surging in the polls let's -- let the pictures tell the story here's a picture of Santorum speaking at a pizza joint roughly. Two or three weeks ago barely anyone interested in anything -- asked to say here he is. Yesterday speaking at a packed at the -- -- a joint. Our earlier today Santorum was being chased around by immediate stroman looked almost as if they were in pursuit of Lindsay -- wonder some celebrity now the big question for Percy and sent first -- -- -- -- I Diane is will he be able to expand beyond this base of Christian conservatives who are key here in Iowa but not so much in other states -- while we're joined him earlier today when he went to -- morning Christian school he spoke to students there and parents he talked about the importance. Of marriage he prayed with them. But the question is can he expand beyond these voters I am. All right check quite a contrast to the pictures before and now and Rick Santorum of course now writing last minute rocket fuel. So where -- the -- former governor Mitt Romney ABC's anchor David Muir has been with him to -- Davis. Diane make no mistake about it this is a huge night for Mitt Romney a chance for him finally that. Close the deal here in Iowa did re write the headlines of four years ago that disappointing loss back then. He appeared very confident today in front of his supporters -- behind the scenes with us acknowledging that he's near the top of the -- he was very careful not to say he's out the top. But I want to show you a moment that played out today a voter approaching Mitt Romney -- -- Wilson. She said she barely can find -- her husband is out of work as well they have no health care it she said if he's elected here was her plea to governor Romney. Please if you win if you want to watch. Save this topic is an -- -- we just. A very personal moment there this morning here into mowing the governor telling her that that's -- he's best suited to be president. Again -- to his experience in the private sector in business to create jobs if he's elected -- goes to Washington and I should put -- Diane that. -- is here with his family awaiting the results of the caucuses here tonight and they tell me he's preparing for Saturday -- ABC needs to be. Okay Dana thanks to you and now let us turn to ABC news Jon Karl who has news from another race to the finish line job. Diane we're here -- -- Ron Paul headquarters -- spoken with a Ron Paul campaign. They think they can win here tonight in fact they're already setting up to shoot a campaign commercial here what they hope will be a victory celebration. An astounding turnaround and why are they confident. Why did the other campaigns fear Ron Paul -- his supporters. We were out with the hall brigades today these are these. -- mostly young supporters out there. Who see this is a movement. This is more than a campaign they like Ron Paul and his message of personal liberty get the government out of our lives even personalized. Legalizing drugs cutting taxes rolling back the war on terror and -- support him no matter what but here's the challenge for him. First of all those supporters have no second choice is -- Paul nobody but many of the people we're seeing here he has the largest crowds Diane I've seen in in in Iowa. But many of them are from out of state they've they've driven from Indiana from taxes from Oklahoma from all over the country to come support Ron Paul. The question tonight is how many -- winds will be out there for him tonight large crowds from out of state thank you Jon Karl.

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

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