If reason ruled in politics, the Democratic party would urge its presidential candidates to eliminate the vitriolic posturing from their campaign, and would then begin to concentrate on the only question that matters: Who can beat Reagan? That is different from asking whether Walter Mondale would make a better chief executive than Gary Hart, or whether Hart’s “new ideas” are preferable to Mondale’s old-line liberal values. What troubles me is that, given the rising nastiness, this campaign begins more and more to resemble the terrible script written in 1972, when another new face, George McGovern, was buried by Richard Nixon’s...