Early in the 2016 presidential campaign at a rally in Iowa, candidate Donald Trump looked directly from the stage at Kraig Moss, a supporter whose son had died from a heroin overdose. The crowd cheered as Trump pledged to end the heroin epidemic and praised Kraig as a great father. Moss was hooked. Attending 45 Trump rallies where he often performed songs written in Trump's honor, Moss gained national media attention as the Trump Troubadour. Following...