Joe Biden chooses Philadelphia for 2020 presidential campaign headquarters
Biden has staked much of his campaign pitch on being able to win back Pennsylvania after the state narrowly supported President Donald Trump in 2016.
Joe Biden (second from left) greets people at Gianni's Pizza with his sister Valerie Biden Owens (far right) in Wilmington, Del., last month.Read moreJESSICA GRIFFIN / Staff Photographer
