Kamala Harris is set to deliver the biggest speech of her life Thursday as she accepts the Democratic presidential nomination in Chicago after a historic turnaround in the 2024 White House race.

The 59-year-old US vice president is expected to focus on optimism and her personal story, drawing a contrast with the often dark vision of her Republican rival Donald Trump.

Excitement was already at fever pitch hours before her speech, with delegates clapping and cheering, and special musical guests lined up to perform, including pop star Pink and country band The Chicks.

Speculation swirled about other special guests adding stardust -- including possibly mega-star Beyonce, who has provided Harris with her campaign anthem, "Freedom."

"You know what I'm really excited for?" said Amanda Taylor, a 47-year-old delegate from Missouri. "Of course, Kamala, but I hear maybe Beyonce is going to come!"

Harris has electrified her party and wiped out Trump's polling lead in the space of a single heady month since President Joe Biden dropped out of the contest, amid fears that at 81 he was no longer capable of running.

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