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.

Vice President Kamala Harris and former President Barack Obama used their first joint campaign appearance at a star-studded rally Thursday to mobilize voters in the battleground state of Georgia.

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."