A shadow of a man wearing a cowboy hat falls on a pillar as he enters the polling place at Wickenburg Community Center in Wickenburg, Ariz. Republican voters cast ballots in primaries in Arizona and Michigan. The latest polls show that Mitt Romney has opened up a double-digit lead in Arizona, where a significant percentage of the population shares his Mormon faith and where he probably benefited from large numbers of early voters. (Don Emmert /AFP/Getty Images)
A woman leaves the polling place at Wickenburg Community Center. (Don Emmert / AFP/Getty Images)
Republican presidential candidate and former Massachusetts Gov. Mitt Romney and his wife, Ann, greet children of campaign volunteers as they visit a campaign call center in Livonia, Mich. (Gerald Herbert / Associated Press)
John Vandermark wears his “I Voted” sticker after voting at a farmers market in Royal Oak, Mich. (Joe Raedle / Getty Images)
Republican presidential candidate and former U.S. Sen. Rick Santorum calls a voter looking for support during a visit to his campaign office in Grand Rapids, Mich. (Scott Olson / Getty Images)
Campaign signs for Republican presidential candidate and former House Speaker Newt Gingrich line a desert highway in Paradise Valley, Ariz. (Jonathan Gibby / Getty Images)
Mitt Romney speaks at a press availability after a visit to his Michigan campaign headquarters in Livonia, Mich. (Justin Sullivan / Getty Images)
A man leaves the polling place at Wickenburg Community Center in Wickenburg, Ariz. (Don Emmert / AFP/Getty Images)
Rick Santorum hugs his wife, Karen, before greeting diners at New Beginnings Restaurant in Kentwood, Mich. (Paul Sancya / Associated Press)
