Next week, I’ll be riding a Harley at the Sturgis Biker Rally in South Dakota—with the very same bad-asses who helped reinvigorate my dad’s campaign when it needed it most. So many memories of my father’s political career, especially the two times he ran for president, include bikers. There is something about bikers and biker rallies that makes me feel particularly patriotic and—dare I say it?—Republican. Let me start from the beginning. I have been going to political rallies since I was a young child. If you delve far enough into the depths of Google—and look at pictures scattered throughout...