Republican Mitt Romney won Nevada's caucuses today, while John McCain and Mike Huckabee competed in the South Carolina primary, two races likely to reduce the crowded field of US presidential rivals.
Democrats shared the stage in Nevada, where Hillary Clinton and Barack Obama vied for a caucus victory and the campaign momentum that goes with it.
Mr Romney's western victory marked two straight successes, coming after a win in the Michigan primary earlier in the week that revived the former Massachusetts governor's campaign.
Alone among the Republican contenders, Ron Paul of Texas aired television ads in Nevada, and the libertarian-leaning Texan looked for his best showing of the campaign season.
Nevada offered more delegates but far less appeal to the Republican candidates than South Carolina, a primary that has gone to the party's eventual nominee every four years since 1980 when Ronald Reagan won the presidency.
That made it a magnet for former Tennessee Senator Fred Thompson, who staked his candidacy on a strong showing in the first primary in a southern state, as well as for Mr Romney; Mr McCain, the Arizona senator; and Mr Huckabee, the former governor of Arkansas.