I mentioned this on Twitter this morning, but if the latest Mason-Dixon poll is accurate, and Republican Joe Heck really does beat incumbent Democrat Dina Titus by 10 points in a district that includes roughly a third of Nevada’s voters, it would be hard to imagine a scenario in which Harry Reid wins that state’s Senate race. When a D+2 district shifts that heavily towards a Republican . . . perhaps there will be some ticket-splitting going on, but it would seem to point to a general anti-Democrat/anti-incumbent mood.