Kamala Harris Is Donald Trump's Worst Nightmare for Five Reasons

Vice President Kamala Harris is the leading Democratic contender to take on Donald Trump after President Joe Biden's decision to bow out of the presidential race.

On Sunday, Biden announced he was quitting the race after facing pressure in the aftermath of his debate with Trump in late June, when his poor performance magnified concerns about his age and fitness for office. In his letter on social media, Biden, 81, endorsed Harris, telling his fellow Democrats that "it's time to come together and beat Trump."

The White House contest had been between two elderly white men, but Biden's decision means Trump, 78, will likely face off against the much younger Harris, 59. She would make history as the first woman of color to become a major party's presidential nominee.