Nevadans line up for the Caesar's Palace caucus
Protesters commemorate the burning of the South Carolina state capitol in 1865.
Kara Bonham registers to vote for the Democratic caucus at the University of Nevada on Saturday in Reno, Nev.
Hours in advance, media trucks are already circling the hotel in Spartanburg, S.C., where Donald Trump will hold his primary-night rally this evening.
Caucusgoers pick their sides in Henderson, Nevada.
Supporters of Hillary Clinton and Bernie Sanders cheer on their presidential candidates before entering a caucus site in Las Vegas.
A Trump supporter awaits the campaign's post-primary party.
Democratic presidential candidate former secretary of state Hillary Clinton looks on during a "Get Out the Caucus" at the Clark County Government Center on Friday in Las Vegas.
Spartanburg High School is a polling place in Saturday's South Carolina Republican Primary.
Democratic presidential candidate Hillary Clinton arrives on stage for a Nevada Democratic caucus rally in Las Vegas.
Democratic presidential candidate Sen. Bernie Sanders speaks on the day of the Nevada Democratic caucus in Las Vegas.
Supporters for Republican presidential candidate Donald Trump hold signs during a South Carolina Republican primary night event in Spartanburg, S.C.
Former Florida Gov. Jeb Bush listens to a question during a campaign stop at Wade's Restaurant on Friday in Spartanburg, S.C.
Republican presidential candidate Donald Trump speaks at his election night party in Spartanburg, South Carolina. The New York businessman won the first southern primary decisively.
Supporters of Republican presidential candidate Ted Cruz cheer during a primary night party at the South Carolina State Fairgrounds in Columbia, South Carolina.
Republican presidential candidate Marco Rubio speaks to supporters at a primary night event in Columbia, South Carolina.
Lingering supporters at Donald Trump's rally after he spoke on Saturday in Spartanburg, South Carolina.
Republican presidential candidate Ted Cruz arrives for a South Carolina primary night rally at the South Carolina State Fairgrounds in Columbia, S.C.
Hillary Clinton speaks to a cheering crowd after winning the Nevada Democratic caucus at Caesars Palace in Las Vegas on Saturday.
Democratic presidential candidate Hillary Clinton arrives on stage for a Nevada Democratic caucus rally in Las Vegas.
The Stream is your source for news, photos and analysis from NPR's political team on the ground in South Carolina and Nevada. For more coverage and analysis visit NPR Politics or elections.npr.org .
Copyright 2016 NPR. To see more, visit http://www.npr.org/.