Former VP Biden's 2020 bid reshapes White House race

Biden, 76, a longtime U.S. senator who served two terms as then-President Barack Obama's No. 2, announced his bid in a video describing the high stakes of the race to take on Republican President Donald Trump in next year's election."We are in the battle for the soul of this nation," Biden said.Biden joins U.S. Senator Bernie Sanders of Vermont, a self-described "democratic socialist," atop the 20-candidate field.