
Vice President Joe Biden speaks during a campaign rally at The Opera House at Fort Museum, Thursday, Nov. 1, 2012, in Fort Dodge, Iowa. (AP Photo/Matt Rourke)

Vice President Joe Biden speaks during a campaign rally at The Opera House at Fort Museum, Thursday, Nov. 1, 2012, in Fort Dodge, Iowa. (AP Photo/Matt Rourke)

** FILE ** Texas Gov. Rick Perry looks at the crowd as he is introduced during a stop on his GOP presidential campaign in Fort Dodge, Iowa, on Saturday, Dec. 31, 2011. (AP Photo/Charlie Riedel)

Former Pennsylvania Sen. Rick Santorum, a Republican presidential candidate, speaks during a town-hall meeting at the Fort Dodge GOP headquarters in Fort Dodge, Iowa, on Tuesday. Mr. Santorum sees "momentum" leading up to the caucuses. (Associated Press)

Republican presidential candidate Newt Gingrich greets potential voters Thursday at the Willow Ridge Golf Course in Fort Dodge, Iowa. He vowed to run a positive campaign,, less than three weeks before the GOP caucuses in a state where his once-strong support has slipped recently. (Associated Press)

Tracey Richter is consoled at Webster County District Court in Fort Dodge, Iowa, on Monday after a jury convicted her of murder in the 2001 death of her 20-year-old neighbor. Richter faces life in prison at her Dec. 5 sentencing. (Associated Press)