Rivals push back against Biden's electability pitch

COLUMBIA, S.C. -- Standing before a throng of party faithful in a key early primary state, Joe Biden's leading rivals for the 2020 Democratic presidential nomination sought Saturday to undercut the former vice-president's argument that he's the ideal Democrat to oust U.S. President Donald Trump. They did it without mentioning the 76-year-old front-runner at all. Biden, in turn, didn't mention them either. California Sen. Kamala Harris charged straight at Trump as she addressed hundreds of activi