Mitch McConnell's top prospects across the aisle

The Romney-State Five:

Joe Donnelly of Indiana
Heidi Heitkamp of North Dakota
Joe Manchin of West Virginia
Claire McCaskill of Missouri
Jon Tester of Montana

These are Democratic senators who hail from states Republican Mitt Romney carried in the 2012 presidential election. By definition, then, they represent more conservative places than most of their Democratic brethren, and either by inclination or political necessity move to the right from time to time.