Missoulian: John Driscoll, the Democratic challenger to U.S. Rep. Denny Rehberg, R-Mont., said Tuesday that America needs a crash course to wean itself from oil as its main energy source, switching to resources like solar, wind and nuclear power. “It’s time to break an addiction,” he said. “And there’s only one way to do it, and that’s to stop. (Petroleum) is not the mainstream any more.” Driscoll, who uses solar energy to help power his Helena home, said he opposes calls by Rehberg and …