According to NBC News, the race is currently too early to call, but Sanders has a significant lead in the initial preference vote based on early entrance polls.

Early results from the NBC News Entrance Poll show Warren in third place — at 17 percent — among Nevada Democrats who say they decided on their vote in the last few days; Bernie Sanders holds a thin lead among this group. Warren's performance among these voters isn't that different from her fourth-place standing among earlier deciders; 11 percent of those who decided before the last few days supported her.

After her emotional encounter with Biden, Edwards told reporters off-camera that the former VP needs "to be my president" because she doesn’t "want to have to go through another four years of drinking" with President Donald Trump.

While visiting a caucus site in Las Vegas, Biden was greeted by supporters including Tina Edwards, a retiree, who became overwhelmed with emotions when she saw Biden. “Mr. Joe Biden! I love you! Oh my goodness,” she said before embracing him and crying.

Biden: Democratic primary a battle over 'what direction we take as a party'

Former Vice President Joe Biden said Saturday afternoon at a caucus location in Las Vegas that the Democratic primary is a battle over "what direction we take as a party."

Biden made the comment when asked if the primary is a battle over the soul of the Democratic Party.

"I think it matters a lot, whether or not what direction we take as a party," he told reporters after spending some time shaking hands and mingling with caucusgoers.

Biden said that the most important thing voters are looking for is "authenticity," to be able to deliver what a candidate says they plan to do as president.

"I mean it's just getting down to that, and that's the battle inside the party right now," he said. "And there is a lot of differences among us that are being made more obvious now."

Asked if the former vice president had confidence in the caucus process, Biden said he would be able to answer that once it's over. “This is a complicated process ... " he said. "We’ll see.”

On whether he thinks he could beat Sen. Bernie Sanders, I-Vt., on Saturday, Biden spoke about electability and said polls show that the former vice president would not only defeat Trump in a general election, but he'd also be able to help Democrats pick up House and Senate seats.