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Republican presidential candidates are working their way across iowa at a fast and furious pace. packing in as much last-minute campaigning as they can before caucus tuesday. nbc s brian mooar joins us from washington with the latest on this. good morning. reporter: good morning, lynn. the candidates are battling awayen o the ground and stepping up the air war. good to see you. reporter: the gop presidential candidates are making their closing arguments in iowa. they ll do anything to any other country that we don t want them to do to us and that would solve a lot of our problems. reporter: ron paul is the wild card, polling second, but with the well-organized army of supporters. and that makes him a target. ron paul would be dangerous as a president of the united states. one of the people running for president thinks it s okay for iran to have a nuclear we, i don t. reporter: mitt romney has a shot at winning if heç can convince enough voters he s conservative enough ....

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