Just past the roulette wheel and slot machines, the smoky bars and blinking lights, Nevada Democrats are preparing to weigh in on their party's presidential nomination fight.

With the Nevada caucuses less than a week away, Democratic presidential candidates campaigning Sunday were fixated on a rival who wasn't contesting the state.

As early voting surged in Nevada's nominating contest, former Vice President Joe Biden lashed out at Democratic rival Bernie Sanders on Saturday for not doing enough to control his most aggressive supporters.