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Calling romney a liar and all of this stuff like that, so i think the friend of the democrats is we want this thing continue. >> speaker gingrich said i'm mr. positive, we're going have an experiment, prove the voters reward the nice guy. history says that doesn't work. newt gingrich has a past and he's a smart guy and if he goes overly negative that caustic newt is back. listen to this. >> you called romney as a lie. >> i was asked if i think he's a liar and i said yes. >> why do you feel that? >> le doesn't tell the truth. >> if this gets nasty out of here, newt is wounded, he was at top of ...

-- captions by vitac -- www.vitac.com under two hours from the start of iowa's presidential caucuses. a vote to shrink the field and perhaps give us a front-runner. mitt romney predicting, quote, we're going win this but his opponents are promising the governor will have a much harder time after tonight. this afternoon the former house speaker newt gingrich told reporters his ads will start drawing, quote, a sharper, clearer contrast with governor romney and on cbs this morning, the former speaker, remember, he's the candidate who keeps promising to stay positive, well, gingrich ca...