CHRISTINA BELLANTONI:

Well, it is really hard to know, because when you see a giant number of young people registering — for example, in Los Angeles County alone, you had 61 percent of the new registrants, 236,000 people, 61 percent of those are under the age of 20.

Now, you have seen Senator Sanders has won with young voters basically everywhere. And in all polls, we have seen him doing very well with young voters here in California, so you would assume that that helps him. But you don't know, because there's a lot of people registering to vote with anger towards Donald Trump.

Hillary Clinton has plenty of young people who like her as well. So we are expecting a flood of turnout. And Sanders does seem to have quite a bit of momentum, especially here in Southern California, as he barnstorms the state. I mean, he hasn't left. He has been here every single day for multiple rallies all across the state.