Barack Obama and Mitt Romney have already begun. In Iowa, Both men have so far laid out $2.7 million for air time, and Romney has also spent another $1.7 in New Hampshire. Giuliani and Thompson are poised to pour their cash into Florida, South Carolina, and California, risking that early Romney victories in the first two states won't amount to much in the end. While Romney trails badly in national polls, if he notches a win or two, he'll have that much more free advertising. For a man with an estimated net worth upwards of $250 million, that's a whole lot of Romney on the tee vee.
Meanwhile, though Obama has outspent his rivals in Iowa, he has yet to see it translate into a first place standing in the polls. Clinton still has the lead, with Edwards and Obama in a virtual tie for second. But because it appears that Clinton has a stranglehold on the nomination, an upset in Iowa would have enormous repercussions.
So get ready, America, you're going to be hearing the following phrase more than a few times in the coming months: My name is (insert candidate's name here) and I approve this message.

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