Milwaukee Mayor Tom Barrett is seeking to invoke class warfare in his sinking recall campaign against Wisconsin Gov. Scott Walker, Dustin Hurst writes, and to prove the governor favors the interests of the rich and powerful over ordinary citizens, he's brought in a former president with a net worth of more than $80 million. Bill Clinton lashed out at Walker during a visit late last week, saying common sense calls for “shared prosperity” in good times and “shared sacrifice” in tough times. But even fond memories of the late-nineties economic boom couldn't put much juice into Barrett's claim that Walker is "making the wealthiest people the happiest people” or explain why the current president is not setting foot in the Badger State.