With primary season coming to a close, the state of California remains a ‘do or die’ moment for the Bernie Sanders campaign, as the Vermont senator is looking for a triumphant win in Tuesday’s primary.

Hilary Clinton and Bernie Sanders are virtually neck and neck in several polls released last week, including a USC Dornsife/Los Angeles Times poll released Thursday evening, which shows Sanders leading by a single point against Clinton.

In that LA Times poll, Sanders is ahead with 44 percent to Clinton’s 43 percent among eligible primary voters, yet in that same poll, Clinton is ahead by ten percent among likely voters. Sanders has a bit of a boost thanks to California’s primary allowing independents to vote, however among registered democrats, Clinton still leads Sanders by 4 percent, primarily due to the support from older voters.

Sanders has been campaigning across the whole state of California in recent weeks, hoping that a win in California will convince superdelegates to flip over to his side. Sanders says that he’ll keep running until the Democratic National Convention in Philadelphia in July. Clinton is already looking to the general election, calling herself the presumptive nominee and already taking on Republican nominee Donald Trump. Even though Sanders is still running, Clinton may be correct in assuming she’s now the Democratic nominee, as she currently has 2,310 delegates, including superdelegates, making her just 73 delegates short of the 2,383 needed to clinch the nomination. With a big win in California, Sanders could give his supporters some much-desired hope for the campaign and prove that his presidential run is still very much legitimate.

With Sanders heavily campaigning in California, Clinton made changes to her campaign schedule, adding a rally event in Oakland and canceling a New Jersey event last week.

Several top Democrats, including Senator Diane Feinstein, have called Sanders to drop out of the presidential race, claiming that Sanders is doing more harm than good for the Democratic Party. Many may be already calling for Democrats to rally around Clinton in order to defeat Trump in the general election, however Sanders defeats Trump by a bigger margin than Clinton in nearly every major poll, according to Real Clear Politics.

According to a new Morning Consult poll released Wednesday, 57 percent of Democrats and Democratic-leaning independents believe that Sanders should stay in the presidential race, with 28 percent saying he should drop out.

Six other states vote on Tuesday, however California is one state to keep an eye on as Clinton and Sanders are heading into a dead heat, hoping one of them can win a majority of the 475 pledged Democratic delegates at stake.