As he gears up his putative 2016 presidential campaign, Wisconsin Gov. Scott Walker (R) has found himself increasingly mired in a mess back in Wisconsin. It's not the kind of scandal that sends tabloids into a lather, but it has Democrats pouncing and good government types scolding, and even some state Republicans have piled on Walker. The mess involves an entity called the Wisconsin Economic Development Corp. (WEDC), a state agency Walker himself established when first elected to fulfill his promise of creating a wave of new jobs. The problems at WEDC have multiplied since. Recently, Walker was forced to...