The biggest change in the party profile of the states in 2013 was the Republicans’ gain of three solidly Republican states — meaning those where Republicans outnumbered Democrats by at least 10 percentage points. Those additions were South Carolina, South Dakota, and Oklahoma. However, this was partly offset by a net loss of one Republican-leaning state. At the same time, Democrats had net losses of one solid and one Democratic-leaning state, while the number of competitive states was unchanged.

Overall, the most Democratic-leaning states in 2013 were New York, Hawaii, Rhode Island, Massachusetts, and Maryland, all showing 20-point or better Democratic advantages in party identification. Gallup considers another seven states to be “solidly Democratic,” by virtue of their 10-point or better Democratic advantage.