Clinton, Romney Win Nevada's Presidential Caucuses

Ann Romney (R), wife of Republican presidential candidate Mitt Romney, joins supporters in applause as he starts his Florida swing in Jacksonville January 19, 2008, hours after winning the Nevada primary. REUTERS/Mark Wallhesier (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008

(USA)

US Democratic presidential candidate Sen. Hillary Clinton (D-NY) is introduced by her husband former US president Bill Clinton at a rally in Las Vegas January 18, 2008. The Nevada caucuses are January 19th.

(Rick Wilking/Reuters)

A supporter of Democratic presidential candidate Barack Obama holds up a sign during a campaign appearance by Obama at the University of Nevada, Las Vegas January 18, 2008.

(Robert Galbraith/Reuters)