DES MOINES — Measured by national polling, media attention and millions in the bank, the Republican field appears to have come down to a bout between two heavyweights: Mitt Romney, the former Massachusetts governor, vs. Gov. Rick Perry of Texas.

But in the state where the first nominating votes will actually be counted, the field resembles more of an all-out brawl, with candidates who rank deep on the undercard nationally given a chance to steal an upset finish at or near the top in the Iowa caucuses, the first nominating contest, now probably less than three months away.

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