How the battleground states have shifted over the past decade

 Roll Call -The two parties has changed the most over the last decade have been in the GOP’s favor. But that’s happening largely in Republican states that became more Republican: West Virginia (25.5-point difference between the two parties since 2014), Missouri (17.7 points), Arkansas (15.8 points), North Dakota (12.8 points), Kentucky (11.2 points), Montana (10.5 points), South Dakota (8.1 points) and Alabama (6.8 points)