Democrats slam Big Oil over $3 gasoline prices Tue May 8, 2007 4:46PM EDT By Tom Doggett WASHINGTON (Reuters) - The U.S. Senate's top Democrat on Tuesday accused big oil companies of shutting down refineries temporarily to raise gasoline prices and rake in"obscene profits." Gasoline prices have topped $3 a gallon at service stations across the country because several oil refineries are offline due to maintenance or accidents, reducing gasoline production and making fuel supplies tight. "It's outrageous ...Isn't it interesting every year about this time, a refinery goes down for repairs," said Senate Democratic Leader Harry Reid of Nevada....