Rep. Michele Bachmann waves to supporters Friday in Sioux City before starting a 99-county bus tour of Iowa. Jeff Haynes/Reuters /Landov hide caption

itoggle caption Jeff Haynes/Reuters /Landov

Newt Gingrich (right) stood his ground Saturday in the GOP presidential debate in Iowa. Mitt Romney (left) may have made a mistake in offering to wager Texas Gov. Rick Perry $10,000. Kevork Djansezian/Getty Images hide caption

itoggle caption Kevork Djansezian/Getty Images

Rep. Ron Paul. Patrick Smith/Getty Images hide caption

itoggle caption Patrick Smith/Getty Images