TAMPA, Fla.—Mitt Romney was never the first choice for conservative Republicans such as Jason Zier, a 43-year-old resident here who jumped on the Herman Cain bandwagon last summer before voting in the primary for Newt Gingrich.

But that hasn't diminished his enthusiasm for supporting Mr. Romney in November. "This is the guy, so let's go," Mr. Zier said.

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