As one of the most contentious presidential elections in history heads to the wire, Washington, D.C.’s newest tourist attraction has just opened, and its focus on civic education cannot come at a more critical time. America’s billion-dollar presidential campaigns remain one of the world’s great spectacles, increasingly stoking partisan fury, civil discord, and simple yet poisonous un-neighborliness (like stealing yard signs). To both sides, this is the most dangerous election in American history, comparable to the fateful 1860 campaign that preceded the American Civil War. Whether Donald…