It’s time to consider whether Gov. Scott Walker is intentionally employing the brazenly dishonest tactics of Sen. Joe McCarthy, who previously held the title as the most dangerous national politician to come out of Wisconsin. Since the 1950s, right-wing Sen. McCarthy has been the worst stain on both Wisconsin politics and the Republican Party nationally. McCarthy achieved that distinction by getting an entire, shameful era in U.S. politics—the McCarthy Era—named after him. McCarthyism turned the ’50s into a reckless, anti-Communist witch hunt as Wisconsin’s Republican senator made wildly irresponsible, untruthful accusations about Communists subverting our government (the moderate Eisenhower administration!),...