Hillary Clinton will finish her presidential campaign in Philadelphia by summoning all of her top surrogates to try to lock down a battleground state that she needs – and she's invited President Obama, who defeated her in 2008 but then helped set up her path to the White House.

President Obama, Bill Clinton, Michelle Obama, and Chelsea Clinton all will be in Philadelphia for the rally, in the city where Democrats held their convention this summer.

The decision to marshal her top surrogates together in one place signals an effort to try to beat Trump with a version of the Democratic map that propelled Obama to two successive victories.

It also shows that she has increasingly come to rely on the firepower of the Obamas - and particularly Michelle, with whom she has had a difficult personal relationship.

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Star power: Clinton is calling on Obama's personal charisma - and especially that of his wife - in a last-ditch seal-the-deal rally in Philadelphia on Monday

Rare meeting: The last known time both the Clintons and the Obamas were together were at the 2014 official opening of New York's National September 11 Memorial and Museum

Electric reaction: Obama went to Miami on Thursday to campaign and got the sort of reception Clinton needs to regain momentum after a battering over her personal trust

Clinton has increasingly come to rely on the firepower of the Obamas - and particularly Michelle, with whom she has had a difficult personal relationship

Clinton campaigned in red state Arizona on Wednesday but immediately flew back to traditional battleground North Carolina early Thursday morning.

Obama, who will speak Monday, has been one of Clinton's most effective surrogates, blasting Donald Trump in his speeches.

On Tuesday, the president even went after the FBI for meddling in the election with a last-minute announcement that the bureau is looking into Clinton's emails again, a volte face from the White House's position on Monday of backing its director James Comey.

Someone is certain to mention that the event is in the 'city of brotherly love' – as Clinton repeatedly mentions Trump's 'insults' of various groups of people.

Clinton also desperately needs Obama to help her reassemble his winning coalition – which pulled together minority voters as well as young voters.

Early voting numbers in North Carolina have seen a drop among African American voters compared to compared to 2012. There are fewer early voting sites in the state.

It isn't known for certain that Michelle Obama will speak, but she has ripped Trump on the campaign trail for his treatment of women and girls – a favorite issue of the first lady and a major portion of Clinton's closing rhetoric.

That ended long years of frostiness between the two women. Clinton had been angered by Mrs Obama hinting at Bill Clinton's infidelities and Mrs Obama had been left furious when he appeared to use racially-tinged language about her husband.

I got you: Obama is now the second-most powerful speaker for Clinton - eclipsed only by his wife. His first endorsement was at the Democratic Convention in Philadelphia, where the rally will be on Monday

Family affair: Chelsea will also be on the concert stage on Monday night - but Tim Kaine will not be

Latest poll blow: Clinton is in the margin of error in Thursday's national poll

The Cook Political Report lists Pennsylvania as 'lean Democratic.'

Clinton has spent the final days of the campaign bloodying Trump for his infamous 'p****' tape – even campaigning with former Miss Universe Alicia Machado in Florida. The 'woman card' attack on Trump has been a major feature of her stump speeches, which focus on the idea that Trump is 'unfit' for the presidency.

Bill Clinton has been campaigning around the country for Clinton, focusing on the industrial Midwest and other areas where he can try to appeal to an array of voters including working class whites who have been learning toward Trump.

Clinton's final days show considerable time in blue states – prompting Trump campaign manager Kellyanne Conway to say Thursday that 'we are in her head.'

'You all love to talk about how demographic has shifted – these 'blue states,' the 'blue wall,' Conway said on CNN. 'We are in her head, and we are forcing her and Tim Kaine, and President Clinton and President Obama and Vice President Biden into traditionally blue states.'

Clinton campaigns in heavily Democratic Detroit on Friday.