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Rep. Ron Paul poses with Jon Hathaway as he holds up the tail of his dog Tizzy at the Iowa State Fair Grounds in Des Moines, Iowa.

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Texas Gov. Rick Perry speaks in Oskalossa, Iowa.

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Rep. Ron Paul waits to be introduced at the Iowa Speedway in Newton, Iowa.

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Former Massachusetts Gov. Mitt Romney greets supporters after at Homer's Deli and Bakery in Clinton, Iowa.

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Rep. Ron Paul salutes veterans at the Iowa State Fairgrounds in Des Moines, Iowa.

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Former House Speaker Newt Gingrich and his wife Callista greet Tonya Tran of Natural Nails salon at the Southbridge Mall in Mason City, Iowa.

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Former House Speaker Newt Gingrich speaks to reporters at the Southbridge Mall in Mason City, Iowa.

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Perry greets locals dat Adams Street Espresso in Creston, Iowa. Republican presidential hopefuls descended on Iowa Tuesday in a final push for a win in the first voting contest of 2012 that could propel their campaigns to the Republican nomination and a chance to take on President Barack Obama.

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Eighteen-month-old Ben Flynn wears a campaign sticker while waiting with his family for the arrival of Romney for a rally at the Hotel Blackhawk in Davenport, Iowa.

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A Gingrich supporter awaits the candidate at the Dubuque Golf and Country Club in Dubuque, Iowa.

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Bachmann laughs with Robin Read in her home during a campaign stop in Shenandoah, Iowa.

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Sue Bleuer of Sherrard, Ill., and fellow supporters of Paul wave signs as people arrive for a campaign event in Davenport, Iowa.