US election: Obama officially endorses Hillary Clinton

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media captionHillary Clinton tweeted President Obama's endorsement video: "I don't think there's ever been someone so qualified to hold this office"

President Barack Obama has officially endorsed Hillary Clinton as the Democratic Party presidential nominee.

His endorsement came after meeting Vermont Senator Bernie Sanders who has been battling Mrs Clinton for the nomination.

Speaking in a video tweeted out by Mrs Clinton, Mr Obama said she may be the most qualified person "ever" for the role of president.

Leading liberal politician Elizabeth Warren also endorsed Mrs Clinton.

"I am ready to get in this fight and work my heart out for Hillary Clinton to become the next president of the United States," the Massachusetts senator told MSNBC, "and to make sure that Donald Trump never gets any place close to the White House."

President Obama and Mrs Clinton are set to start campaigning together soon.

"I want those of you who've been with me from the beginning of this incredible journey to be the first to know that 'I'm with Her.' I am fired up and cannot wait to get out there and campaign for Hillary," Mr Obama said in the video.

"Secretary Clinton and Senator Sanders may have been rivals during this primary, but they're both patriots who love this country and they share a vision for the America that we all believe in."

The two ran against one another for the Democratic nomination in 2008 and Mr Obama later made Mrs Clinton secretary of state.

Speaking to Reuters following the endorsement, Mrs Clinton said Mr Obama's endorsement "means the world".

"It is absolutely a joy and an honour that President Obama and I, over the years, have gone from fierce competitors to true friends," she said.

Presumptive Republican nominee Donald Trump tweeted that Mr Obama's endorsement means he wants "four more years of Obama" and "nobody else does".

To which came a much-retweeted reply from Mrs Clinton: "Delete your account."

Analysis - Anthony Zurcher, BBC News North America reporter

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image captionMr Obama has made his endorsement official

Barack Obama is now in the game. In a slickly produced video endorsement, the president has thrown his support behind Hillary Clinton's bid to keep the White House in Democratic hands.

Given the high production value of the video, the announcement had obviously been in the works for some time. In fact, astute observers have noted that Mr Obama is sporting the tie he wore on Tuesday.

Bernie Sanders has said he will continue to campaign in Washington DC, leading up to the capital city's primary next week - but expect most Democrats to close ranks quickly. The Vermont senator even struck a more conciliatory tone after a meeting at the White House, saying he looks forward to "working together" with the former secretary of state to defeat Donald Trump.

Mr Obama and Mrs Clinton will make their first joint appearance together in Wisconsin next week. Before that she's visiting Ohio and Pennsylvania.

The Democrats clearly view the general election battleground as the industrial Rust Belt states. And for the first time since 1988 there is a popular, scandal-free second-term incumbent president working hard on the campaign trail to preserve his legacy.