Democrats are desperate to beat Bush and take back the White House. But is John Kerry really the answer? asks PAUL WELLS.IN POLITICS just as in real life, events have a way of messing up the best-laid plans. U.S. Democrats aren't surprised to have a clear front-runner as the state-by-state battle to win the party's presidential nomination picks up steam. They're just surprised by who it is.Only a month ago, the runaway favourite was Howard Dean, the nondescript former Vermont governor who had almost magically transformed himself into a populist firebrand and Internet fundraising juggernaut. There was talk of Dean...