SALT LAKE CITY — Mitt Romney became the instant front-runner when he announced his U.S. Senate campaign last week, as a new poll shows him with a commanding lead four days into the race. A Utahpolicy.com poll released Tuesday shows 60 percent of Utahns would vote for the former Massachusetts governor among declared and possible candidates for the office. Only Democratic Salt Lake County Councilwoman Jenny Wilson polled in double digits, with a meager 14 percent. Libertarian Craig Bowden and Rep. Dan McCay, R-Riverton, who has not entered the race, fared the best among the rest at 3 percent and...