The Iowa Caucuses mean different things to different candidates. Of course Barack Obama, Hillary Clinton and John Edwards, for the Democrats, and Mike Huckabee and Mitt Romney, for the Republicans, are vying for a win there. But there are separate sub-primaries going on, as well: Obama vs. Edwards for the position of chief challenger to Clinton; McCain vs. Giuliani for the right to wear the "moderate" Republican mantle; and Fred Thompson vs. Oblivion for the right to stay in the rac ...

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