We all know that the definition of insanity is trying the same thing that failed, again and again. Thus, the Democratic Party's determination to stick to the same tired playbook that lost control of the U.S. House in 2010, the Senate in 2014, and the White House in 2016 is officially insane. The intensity of the anti-Trump resistance — people who were barely engaged in politics two years ago, now determined to knock on neighbors' doors or even run themselves if that's what it takes — is the game-changer the Democrats have been waiting for. The tired establishment can lead, follow, or get out of the way. Or put up a wall, the dumbest possible choice.