In the kickoff contest of the 2012 presidential race, Republican candidates argued up to Tuesday\'s finish line in Iowa over which candidate the voters can trust and who they can count on to defeat President Barack Obama.
Rick Santorum Republican presidential candidate, former Pennsylvania Sen. Rick Santorum reacts to a question from the media at a campaign stop at Valley High School, Tuesday, Jan. 3, 2012, in West Des Moines, Iowa. (AP Photo/Charlie Riedel)
AP Photo/Charlie Riedel
Newt Gingrich Republican presidential candidate, former House Speaker Newt Gingrich, buys two scoops of "Moose Tracks" ice cream, which is vanilla ice cream with chocolate peanut butter cups swirled with thick chocolate fudge, as he campaigns at Elly's Tea and Coffee House in Muscatine, Iowa, Tuesday, Jan. 3, 2012. (AP Photo/Charles Dharapak)
AP Photo/Charles Dharapak
Newt Gingrich, Callista Gingrich Republican presidential candidate, former House Speaker Newt Gingrich, stands with his wife Callista as he buys two scoops of "Moose Tracks" ice cream, which is vanilla ice cream with chocolate peanut butter cups swirled with thick chocolate fudge, as he campaigns at Elly's Tea and Coffee House in Muscatine, Iowa, Tuesday, Jan. 3, 2012. (AP Photo/Charles Dharapak)
AP Photo/Charles Dharapak
Rick Perry Republican presidential candidate, Texas Gov. Rick Perry speaks during a campaign stop in Des Moines, Iowa, Tuesday, Jan. 3, 2012. (AP Photo/Chris Carlson)
AP Photo/Chris Carlson
Rick Perry Competing campaign signs line the sidewalk in downtown Des Moines, Iowa, Tuesday, Jan. 3, 2012. (AP Photo/Chris Carlson)
AP Photo/Chris Carlson
Rick Perry Visitors listens as Republican presidential candidate, Texas Gov. Rick Perry speaks during a campaign stop in Des Moines, Iowa, Tuesday, Jan. 3, 2012. (AP Photo/Chris Carlson)
AP Photo/Chris Carlson
Rick Perry Republican presidential candidate, Texas Gov. Rick Perry speaks during a campaign stop in Des Moines, Iowa, Tuesday, Jan. 3, 2012. (AP Photo/Chris Carlson)
AP Photo/Chris Carlson
Rick Perry Republican presidential candidate, Texas Gov. Rick Perry speaks during a campaign stop in Des Moines, Iowa, Tuesday, Jan. 3, 2012. (AP Photo/Chris Carlson)
AP Photo/Chris Carlson
Rick Perry Republican presidential candidate, Texas Gov. Rick Perry shakes hands after a campaign stop in Des Moines, Iowa, Tuesday, Jan. 3, 2012. (AP Photo/Chris Carlson)
AP Photo/Chris Carlson
William Temple William Temple shows his support for Republican presidential candidate, Rep. Michele Bachmann, R-Minn., as her bus departs following a campaign stop at Valley High School, Tuesday, Jan. 3, 2012, in West Des Moines, Iowa. (AP Photo/Eric Gay)
AP Photo/Eric Gay
Michele Bachmann Republican presidential candidate, Rep. Michele Bachmann, R-Minn. waves from her bus following a campaign stop at Valley High School, Tuesday, Jan. 3, 2012, in West Des Moines, Iowa. (AP Photo/Eric Gay)
AP Photo/Eric Gay
Ron Paul Republican presidential candidate, Rep. Ron Paul, R-Texas speaks to students during a campaign stop at Valley High School, Tuesday, Jan. 3, 2012, in West Des Moines, Iowa. (AP Photo/Eric Gay)
AP Photo/Eric Gay
Michele Bachmann Republican presidential candidate, Rep. Michele Bachmann, R-Minn., center, talks to the media following a campaign stop at Valley High School, Tuesday, Jan. 3, 2012, in West Des Moines, Iowa. (AP Photo/Eric Gay)
AP Photo/Eric Gay
Newt Gingrich, Callista Gingrich Republican presidential candidate, former House Speaker Newt Gingrich, and his wife Callista, campaign at Elly's Coffee Tea and Coffee House in Muscatine, Iowa, Tuesday, Jan. 3, 2012. (AP Photo/Charles Dharapak)
AP Photo/Charles Dharapak
Callista Gingrich Callista Gingrich, wife of Republican presidential candidate, former House Speaker Newt Gingrich, left, campaigns at Elly's Coffee Tea and Coffee House in Muscatine, Iowa, Tuesday, Jan. 3, 2012. (AP Photo/Charles Dharapak)
AP Photo/Charles Dharapak
Mitt Romney Republican presidential candidate former Massachusetts Gov. Mitt Romney poses with residents during a caucus day rally at the Temple for Performing Arts, Tuesday, Jan. 3, 2012, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
AP Photo/Charlie Neibergall
Mitt Romney Republican presidential candidate former Massachusetts Gov. Mitt Romney speaks during a caucus day rally at the Temple for Performing Arts, Tuesday, Jan. 3, 2012, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
AP Photo/Charlie Neibergall
Mitt Romney, John Thune Republican presidential candidate former Massachusetts Gov. Mitt Romney, accompanied by Sen. John Thune, R-S.D., left, greets residents during a caucus day rally at the Temple for Performing Arts, Tuesday, Jan. 3, 2012, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
AP Photo/Charlie Neibergall