What to know now that Biden has left the raceVice President Kamala Harris has quickly shored up support for her campaign, with a majority of pledged delegates backing her and endorsements from scores of Democrats, including former House Speaker Nancy Pelosi and Bill and Hillary Clinton.In her first visit to campaign headquarters, Harris gave a glimpse of how she would battle former President Donald Trump if she's the Democratic nominee. President Joe Biden called into her campaign headquarters during the visit and made his first public remarks since he dropped out of the race.Trump's running mate, Sen. JD Vance of Ohio, today held his first campaign events as the GOP vice presidential nominee. Before Vance took the stage at his first event, an Ohio lawmaker warned that "it's going to take a civil war to save this country" if Trump loses. The lawmaker later apologized for the remark.