John McCain increasingly is looking like the hapless Hubert H. Humphrey of 1968. Captive to his own partisan support for a disastrous war; too timid to stake out an agenda for change; passively permitting an unpopular president to embrace him as heir; squandering what little was left of his good repute in shabby political maneuvering. It’s Humphrey all over again. McCain is busy tying a dead weight around his shoulders that he imagines is the mantle of the presidency. The endorsement today by Bush went a long way toward sealing his fate.