Have you heard the one about the preacher's son who was running for political office? It gets better (and by "better," I don't mean "funny.") The preacher's son, John Lujan, is an 18-year veteran of the San Antonio Fire Department. For each of those 18 years, he's voluntarily paid his dues to the union, the San Antonio Professional Firefighters Association. This is the same association that operates under the umbrella of the local AFL-CIO, which represents a variety of local unions. It's also the same association that recently endorsed Lujan in his bid for state representative in House District 118....