From NPR:

Big Republican gains in November could have lasting consequences. Legislators elected in the fall will redraw congressional boundaries next year. Control over the redistricting process could sway outcomes in dozens of districts over the next decade.

“If you’re going to have a good year, have it in a year that ends in zero,” says Ed Gillespie, a former Republican Party chairman who is heading up the GOP’s state-level efforts this year.

…

Part of the reason is simple math. Democrats are offering up many more targets.

About 6,000 of the nation’s 7,400 legislative seats are at stake this fall. Democrats currently hold 55 percent of the total. The party also controls 60 chambers nationwide, compared with 36 that are held by Republicans. (Two are tied and one – Nebraska’s — is nominally nonpartisan.)

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