Some time very soon, President George Bush is expected to sign a $400 billion bill adding a prescription-drug benefit to Medicare -- and he is sure to be flanked not only by Republicans but also by Democrats, perhaps including that arch-liberal, Senator Ted Kennedy. It's an image that is apt to drive former President Bill Clinton around the bend. The Democrats have, in effect, agreed to hand to Bush precisely the kind of politically precious legislative victory on health care that the Republicans went to any lengths to deny to Clinton back in 1994. Could it be that the Democrats...