Allysia Finley: Behind the GOP Statehouse Juggernaut ... You might say they overachieved: In 2010 Republicans picked up 675 legislative seats, flipped 21 chambers, and won complete control of 25 statehouses. This year Mr. McCollum credits a “perfect storm” of strong candidates, effective strategy and a highly charged political atmosphere that delivered 69 of 99 state legislative chambers to Republican hands, exceeding the party’s previous high-water mark of 64 in 1920. Republicans this year flipped nine state legislative chambers: the Colorado Senate; Maine Senate; Minnesota House; Nevada Senate and Assembly; New Hampshire House; New Mexico House and West Virginia House and Senate. Next year, the GOP will control the legislatures and governorships in 23 states, while Democrats will enjoy hegemony in seven—California, Delaware, Oregon, Hawaii, Vermont, Rhode Island and Connecticut. Bolstering the GOP’s ranks in state government, Republicans will have 31 lieutenant governors, 28 s...