Republican candidates made sizeable gains in the November 2 election not only at the federal level, but also at the state level. According to the National Conference of State Legislatures, control switched from Democrats to Republicans in 11 state legislatures, including Maine, Pennsylvania, and Wisconsin. Beginning in 2011, more Republicans will serve in state legislative seats than at any other time since 1928.
NCSL has more information on the composition of state legislatures and a post-election map.