Donald Trump and Hillary Clinton are expected to up their delegate leads and pull away from their rivals. But those aren't the only things that could happen. Be ready for surprises.
More Republicans have voted in early primary states than ever before, while Democratic turnout has dropped off from 2008's historic numbers. But that might not equal success in November for the GOP.
At one caucus, "just four people took the stage, including former Virginia Attorney General Ken Cuccinelli, who drew a chorus of boos when he announced his support for Ted Cruz," a newspaper reports.
The real estate mogul is once again the favorite to win the Silver State's caucuses, with Texas Sen. Ted Cruz and Florida Sen. Marco Rubio also battling for a strong finish.
In any normal year, a Republican who wins big in New Hampshire and South Carolina would practically be seen as the presumptive nominee. So why isn't that happening this year?
Until recently, Corey Lewandowski was an obscure political operative. Now, he's engineered wins in South Carolina and New Hampshire for Trump's once-implausible presidential campaigns.
Evangelical voters have faith in Donald Trump, but there's still an opening for Marco Rubio in a much clearer establishment lane after Jeb Bush's exit. Plus: Clinton wins big with older, black voters.
Donald Trump will get 50 delegates from his Palmetto State win, but both Marco Rubio and Ted Cruz tried to spin their finishes as a victory as the field winnowed with Jeb Bush's withdrawal.