How President Obama is getting involved in the 2016 election

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Hillary Clinton made history last night: cementing her place as the first woman to become a presumptive presidential nominee of a major party. Clinton won Tuesday's biggest prize, California, along with New Jersey, New Mexico, and South Dakota.

Although Clinton had enough delegates to clinch the Democratic nomination on Monday, she said little about it, instead waiting for Tuesday's voters to get their say. They did, and Clinton celebrated, acknowledging the history unfolding before her.

Clinton told a packed crowd of supporters near her campaign headquarters in Brooklyn, "Tonight's victory is not about one person. It belongs to generations of women and men who struggled and sacrificed and made this moment possible."

Following that speech, President Obama called Clinton to congratulate her on clinching the Democratic nomination. That's a big change from exactly 8 years ago yesterday, when Clinton called the then-Senator Obama to congratulate him on winning the nomination.

President Obama will meet with Bernie Sanders tomorrow. The meeting was scheduled at Sanders' request, according to the White House.

Meanwhile, Sanders is vowing to continue his fight, taking it all the way to the convention next month. Yesterday, he said he's not ready to concede the nomination to Clinton. This, despite Clinton's widely accepted status as the party's presumptive nominee. However, changes are coming to the Sanders' campaign. ABC News reports his campaign will lay off half its staff in the next week.