Biden in lead, but does campaign have enthusiasm to keep it?

When Joe Biden took the stage in New Hampshire, he was greeted with the respect that comes with being a former vice president.The scene at New Hampshire's Democratic convention on Saturday highlighted one of the riddles of Biden's candidacy: He maintains a lead in nearly every poll, but his campaign events often lack the look and feel of a front-runner.Biden's team insists such optics are overrated as indicators of a candidate's strength.