MYRTLE BEACH, S.C. (AP) — Democrats Hillary Clinton and Bernie Sanders included some casino stops during their pre-caucus Nevada campaign swings.

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Both greeted union members and other workers and Clinton was later joined by her husband and daughter. Sanders attended a rally and concert in Henderson, Nevada.

The stakes in Nevada far outstrip the 23 delegates up for grabs. The state was supposed to be part of Clinton's so-called "firewall" against Sanders, one of a series of heavily-minority states that follow mostly white Iowa and New Hampshire where Clinton would do well. But Sanders has poured resources into the state and drawn large and increasingly diverse crowds.

In South Carolina, which holds its Republican primary today, Donald Trump called for a boycott of Apple until it complies with a court order to help investigators break into an iPhone used by one of the San Bernardino mass shooters. He also defended his support of waterboarding as "minimal torture."

Trump has been the South Carolina front runner.

AP Polls: GOP voters say Trump can win, Sanders' message has legs

COLUMBIA, S.C. (AP) — Donald Trump has emerged as the front-runner for the GOP nomination by winning over roughly a third of Republicans in the early voting states and in preference polls.

His critics argue he'll never be able to grow that wide-but-only-so-deep coalition with his contentious ways.

But a new AP-GfK poll finds registered Republicans and GOP-leaning voters put Trump at the top of the GOP field when it comes to which candidate fits best with their stand on the issues.

They give Trump best marks for competence and decisiveness. And far more Republicans than not say they'd vote for Trump in the general election, and 86 percent of Republican voters think he can win in November.

A poll by The Associated Press-NORC Center for Public Affairs Research suggests support within the Democratic party for Bernie Sanders' fiery calls to increase regulations on Wall Street banks and address wide income gaps between rich and poor.