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Supporters of Mitt Romney and Newt Gingrich at Nevada rallies

Emmanuel Dunand / AFP - Getty Images

Members of the Fisher family show their support to Republican presidential hopeful Mitt Romney at a campaign rally at El Aero Services Inc. at Elko International Airport in Elko, Nevada, on Friday.

Rick Wilking / Reuters

Dee Hummel (R), a supporter of Republican presidential candidate Newt Gingrich, cheers at a campaign rally at Stoney's Rockin' Country dance hall in Las Vegas on Friday. At left is Hummel's daughter Cindy Buck.

Emmanuel Dunand / AFP - Getty Images

Republican presidential hopeful Mitt Romney supporters arrive to a campaign rally at El Aero Services Inc. at Elko International Airport in Elko, Nevada, on Friday.

Evan Vucci / AP

Supporters listen to Republican presidential candidate, former House Speaker Newt Gingrich speak at Stoney's Rockin Country in Las Vegas on Friday.

Duricka / AP

Historian, author, member of Congress and speaker of the House — a look back at his public life.

Jonathan Ernst / Getty Images

From governor's son to presidential contender, a look at the life of Republican Mitt Romney.

More coverage of the Republican primary race in PhotoBlog.