With less than 24 hours to go until California Democrats go to the polls in the last major primary contest of the 2016 race, Hillary Clinton is talking like the presidential nomination is all but over. “After Tuesday, I’m going to do everything I can to reach out, to try to unify the Democratic Party and I expect Senator Sanders to do the same,” she said Sunday on CNN’s State of the Union. The message to her unexpectedly resilient Democratic rival, Bernie Sanders, was clear: it’s time to drop out and move on.

In 2008, Clinton was in a similar situation to where Sanders finds himself now, but abandoned her presidential campaign and ceded the race to Barack Obama when it was clear she wouldn’t win—a precedent she pointed to Sunday, and again on Monday, in urging Sanders to face reality and help unify the party against Donald Trump. “Tomorrow is eight years to the day after I withdrew and endorsed then-senator Obama. I believed it was the right thing to do,” she told reporters at a campaign stop in Los Angeles, The Guardian reports. “No matter what differences we had in our long campaign, they paled in comparison to the differences we had with the Republicans.”

Sanders, however, has shown little indication that he plans to clear Clinton’s path to the nomination without a fight. With Clinton-leaning New Jersey also voting Tuesday, the former secretary of state is expected to easily win the 26 remaining delegates she needs to secure the Democratic nomination (Update: after winning the Puerto Rico primary on Sunday, Clinton needs 23 delegates to secure the nomination)— even before the results from California begin to roll in. But Sanders has aggressively continued his campaign nonetheless, and is polling within two percentage points of Clinton in the Golden State. Losing California might not stop Sanders, either. The New York Times reports that the self-proclaimed socialist is continuing to lobby superdelegates and is committed to fighting for a contested convention. And, even if he does concede, that doesn’t mean that Sanders will hand over his endorsement easily. “It is Secretary Clinton’s job to explain to those people why she should get their support,” he told CNN’s Jake Tapper in a separate interview Sunday.

Losing California wouldn’t doom Clinton, but it would be a major psychological victory for Sanders—one that would bolster his campaign to sway Clinton’s superdelegates or, at the very least, give him greater leverage to change the party’s platform at the convention. And while polls give Clinton a slight edge going into Tuesday, there are signs that Sanders could be headed for an upset. Nearly 18 million Californians have registered to vote, which the Los Angeles Times reports is a record high in advance of a primary election. The outlet reports that 650,000 people registered over the past six weeks, representing 98 percent of the total growth in California's voter rolls so far this year. That surge could be welcome news for Sanders, who tends to capture a larger percentage of young and independent voters. Should the new registrants cast their votes for Sanders, it’s unlikely he’ll agree to go quietly—no matter what Clinton expects.