The Hill: Sen. Russ Feingold (D-Wis.) is taking aim at GOP opponent Ron Johnson’s claim that climate change more likely stems from sunspots rather than human activity. “I’m not going to take a course in Ron Johnson science any time soon,” Feingold said in an interview Wednesday with WisPolitics.com, calling it one of several “bizarre ideas” that Johnson has. “This notion that he knows better than most of the scientists in the world is a little preview of what you might get if he was your …