BEALLSVILLE, Ohio (August 14, 2012)--Republican presidential candidate Mitt Romney promised voters Tuesday in coal-rich eastern Ohio that America won't have to buy oil from Venezuela or the Middle East by the time his second term ends in 2021.

Romney stopped Tuesday outside a coal mine in Beallsville, where he said the U.S. would be independent from energy sources outside North America if he’s elected in November and serves two, four-year terms.

Introducing Romney was Josh Mandel, who is running against Democratic Ohio Sen. Sherrod Brown.

Mandel accused Democrats of trying to stand in the way of using all energy sources.

Romney was finishing a four-day bus tour with three stops in Ohio.