Forget Michigan. If Rick Santorum really wants to hand Mitt Romney his head he ought to challenge him in Massachusetts. It is here, not in Michigan, where Romney, governor for four years, made his political bones, first by running unsuccessfully against the late Sen. Ted Kennedy, and then defeating Democrat Shannon O'Brien for governor in 2002. It is also here where thousands of people -- to their total surprise -- woke up the other day to find that Romney ran the state as a "severely conservative" governor for four years. Who knew? That was before he declined to run for...