Harris' whirlwind campaign started with a big jump in polls after President Joe Biden dropped out of the race in late July, but her lead has narrowed in national polls and evaporated in the battleground states that will decide the U.S. election.

In his first joint campaign rally with Vice President Kamala Harris, Obama made fun of former President Donald Trump 's "word salad" speeches, as well as Trump's claim that he singlehandedly delivered the US a strong economy. "Yeah, it was good," Obama said as the audience laughed and applauded. "It was my economy."

Vice President Kamala Harris and former President Barack Obama used their first joint campaign appearance, on Thursday night in this Atlanta suburb, to issue parallel warnings about the dangers facing the country if Donald Trump is elected again to lead it.