There is a boisterous Oath Keeper leaking alcohol from every pore sitting three seats away from me in a Nashua, New Hampshire, middle school auditorium hosting a Ted Cruz town hall. I'm wondering if it's too late to change seats. The guy is wearing a camouflage jacket that doesn't quite hide the bulging middle-age belly straining at the faded Patriots T-shirt underneath. He's carrying a sign that reads "Like a Cruz missile, Ted will destroy ISIS" on one side and "Cruzin West" on the other, a plea for the Texas senator to pick former Florida congressman Allen West as his...