HARRISBURG, Pa. (AP) Pennsylvania’s Democratic U.S. Sen. Bob Casey is endorsing Joe Biden for president, just minutes after the former vice president entered the 2020 race. In a statement Thursday, Casey touted Biden as a fighter for the middle class who can beat President Donald Trump in Pennsylvania if Biden becomes the Democratic nominee. Casey himself spent two years in the Senate with Biden before the Delaware senator went on to become vice president under President Barack Obama.