As Barack Obama has moved America's policies to the left, the country's response has been to move to the right.
Via Gallup:
Democrats have lost their solid political party affiliation advantage in 18 states since 2008, while Republicans have gained a solid advantage in 6 states. A total of 17 states were either solidly Republican or leaning Republican in their residents' party affiliation in 2011, up from 10 in 2010 and 5 in 2008. Meanwhile, 19 states including the District of Columbia showed a solid or leaning Democratic orientation, down from 23 in 2010 and 36 in 2008. The remaining 15 states were relatively balanced politically, with neither party having a clear advantage.
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