Politico: “After several cycles of ceding ground to Republicans, Democrats believe their top-of-the-ticket energy could power a major comeback in states like Michigan, Wisconsin and Iowa. And it’s not just talk — they’re investing millions in the red-tinted turf.” “As new polling comes in, Democrats are increasingly directing money and manpower toward targets like Michigan’s 10th, Wisconsin’s 3rd and Iowa’s 1st and 3rd.