Kirk Bangstad, the twice-failed Democratic candidate who owns the Minocqua Brewing Company in Wisconsin, turned his fantasizing about President Donald Trump's death into a marketing strategy.That strategy appears to have been short-sighted in light of federal law enforcement's recent interest in the blubbering brewer and his incendiary remarks.How it startedBangstad vowed in January to give fellow travelers "free beer, all day long, the day he d…