U.S. President Barack Obama said Saturday "there are a few things we can do" but "there's no silver bullet that can bring down gas prices right away." In his weekly radio and Internet address, the president said with U.S. gasoline prices at about $4 a gallon "you see politicians racing to the cameras, waving three-point plans for two-dollar gas. You see people trying to grab headlines or score a few points." "The truth is, there's no silver bullet that can bring down gas prices right away," he said.