LOS ANGELES — Striding into history, Hillary Clinton will become the first woman to top the presidential ticket of a major U.S. political party, capturing commitments Monday from the number of delegates needed to become the Democrats’ presumptive nominee.

The victory arrived nearly eight years to the day after she conceded her first White House campaign to Barack Obama. Back then, she famously noted her inability to “shatter that highest, hardest glass ceiling.”

Campaigning this time as the loyal successor to the nation’s first black president, Clinton held off a surprisingly strong challenge from Vermont Sen. Bernie Sanders. He mobilized millions with a fervently liberal message and his insurgent candidacy revealed a deep level of national frustration with politics-as-usual, even among Democrats who have controlled the White House since 2009.

CLINTON ON A ROLL

Clinton, the former secretary of state, New York senator and first lady, reached the 2,383 delegates needed to become the presumptive Democratic nominee on Monday with a decisive weekend victory in Puerto Rico and a burst of last-minute support from superdelegates. Those are party officials and officeholders, many of them eager to wrap up the primary amid preference polls showing her in a tightening race with presumptive Republican nominee Donald Trump.

Clinton has 1,812 pledged delegates won in primaries and caucuses. She also has the support of 571 superdelegates, according to an Associated Press count.

The AP surveyed all 714 superdelegates repeatedly in the past seven months, and only 95 remain publicly uncommitted.

While superdelegates will not formally cast their votes for Clinton until the party’s July convention in Philadelphia, all those counted in her tally have unequivocally told the AP they will do so.

“We really need to bring a close to this primary process and get on to defeating Donald Trump,” said Nancy Worley, a superdelegate who chairs Alabama’s Democratic Party and provided one of the last endorsements to put Clinton over the top.

Clinton outpaced Sanders in winning new superdelegate endorsements even after his string of primary and caucus wins in May. Following the results in Puerto Rico, it is no longer possible for Sanders to reach the 2,383 needed to win the nomination based on the remaining available pledged delegates and uncommitted superdelegates.

Sanders said this past weekend he plans to fight on until the convention, promising to make the case to superdelegates that he is better positioned to beat Trump in November. Superdelegates can change their minds. But since the start of the AP’s survey in late 2015, no superdelegates have switched from supporting Clinton to backing Sanders.

A DECISIVE LEAD

Indeed, Clinton’s victory is broadly decisive. She leads Sanders by more than 3 million cast votes, by 291 pledged delegates and by 523 superdelegates. She won 29 caucuses and primaries to his 21 victories.

That’s a far bigger margin than Obama had in 2008, when he led Clinton by 131 pledged delegates and 105 superdelegates at the point he clinched the nomination.

Echoing the sentiments of California Gov. Jerry Brown, who overcame a decades-long rivalry with the Clinton family to endorse her last week, many superdelegates expressed a desire to close ranks around a nominee who could defeat Trump in November.

“It’s time to stand behind our presumptive candidate,” said Michael Brown, one of two superdelegates from the District of Columbia who came forward in the past week to back Clinton before the city’s June 14 primary. “We shouldn’t be acting like we are undecided when the people of America have spoken.”

Beyond winning over millions of Sanders supporters who vow to remain loyal to the self-described democratic socialist, Clinton faces challenges as she turns toward November, including criticism of her decision to use a private email server run from her New York home while serving as secretary of state.

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