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reiterated his pledge saying, please, republicans should all be nice. here s mr. gingrich, in his own words. i only have one opponent, that s barack obama. i have a number of friends running and one opponent. and i m going to run this campaign on a positive basis because i believe the people of iowa are smart enough that they can see the difference between somebody trying to help the country and somebody who simply is running a negative campaign. can he stay positive is the big question because speaker gingrich make no mistake, is feeling the heat. let s bring in cnn s jim acosta. here in iowa tracking the republican candidates, jim, that is the big question. the speaker s the front-runner. he says let s be nice. describe to our viewers the kind of heat he s getting. reporter: well, you know, it s almost impossible to figure out a direction where he s not being attacked from right now. keep in mind he s has three other candidates in this field attack him with eith ....