How Winning Turned Biden Into a Confident Candidate

Joe Biden strode confidently to the podium, shutters clicking, a bank of cameras beaming to a national audience. "Those of you who have been knocked down, those of you who have been knocked out, this is your campaign," Biden said Wednesday. "We welcome all of those who want to join us. We’re building a movement." The former vice president has found his stride and his voice as he becomes a front-runner for the Democratic presidential nomination. Gone is the sometimes mumbling, almost wistful 77-year-old, standing before small Iowa crowds full of voters lamenting the state of the union. "What in God’s name is happening?" he’d ask, after deviating from anything approaching prepared remarks....