As frigid temperatures scour the Midwest, the Republican presidential nominating process will officially start Monday with Iowa's caucuses. Rarely has so much ridden on a second-place finish in the first nominating state. On the flip side, Trump’s voters are very motivated to support him. His aggressive, social media-driven approach initially attracted some curiosity from Republican voters but seemed to turn many off after he attacked rivals during the debates. ___For the latest updates on the Iowa caucuses, follow the AP’s live coverage.

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