The knock on the door in the dead of night is the stuff of Darkness at Noon, and of the state of Wisconsin. To the question of whether armed police can storm your house and take away your personal effects and tell you to shut up about it, based simply on your political advocacy, Wisconsin answered for years, Why, yes, they can now please, shut up about it. The so-called John Doe investigations into Governor Scott Walker and conservative groups in Wisconsin have been an ongoing travesty that now that Walker is entering the presidential stage should...