Scott Walker is facing re-election for the third time in four years. Let that fact sink in, and you will begin to understand many things about this pivotal race. Wisconsin is not merely a swing state, it is an odd, unique one. The Republican Party was founded there, yet the last time the state chose a Republican presidential candidate was in 1988. Its largest city, Milwaukee, last had a Republican mayor in 1908. It had a socialist mayor (not left-wing Democrat, but outright socialist) in 1960. Nonetheless, the relatively conservative Republican Governor Tommy Thompson, who pioneered welfare reform in the...