Salt Lake Tribune: Why would a politician promulgate policy that would boost gasoline consumption, enrich Big Oil, increase dependence on foreign crude, hasten global warming, rob the federal highway trust fund and threaten thousands of jobs? Actually, there are two short and simple answers to that long-winded question: 1) It’s an election year. 2) John McCain and Hillary Clinton are trying to buy your vote. The proposal for a federal gas tax holiday this summer, contrary to the candidates’ …