I was standing outside the state capitol in Harrisburg, Pennsylvania, where gun-toting defenders of President Donald Trump were supposedly going to start marching at noon. I could see cops, I could see National Guardsmen, and I could see dozens of reporters, but actual protesters were scarce. I did spot a fellow in a Gadsden Flag facemask and a woman whose shirt displayed a slogan about rebellion against tyranny, and as they passed behind me I heard him crack a joke: "I should walk up to the photographers here and say, 'Excuse me, can you direct me to the armed insurrection?'"...