Despite calls for many Democratic politicians and pundits to temper their inflammatory rhetoric, this week has proven a further escalation in this dangerous form of rage rhetoric. DNC Chair Ken Martin just told MSNBC’s “The Beat” that “we may be nearing” the moment when “elections don’t matter and then the resistance looks completely different.” Senate Minority Leader Chuck Schumer called on people to “forcefully rise up.” With political violence on the rise, these leaders are clearly fueling the mob in hopes that they and their party can ride the wave of rage back into power. History suggests that it is...