Barone: GOP will have its biggest ever role in redistricting

Nationally, Republicans narrowly missed winning Senate seats in heavily Democratic Washington and in Nevada and California, where less problematic nominees might have won. As in all wave years, they missed winning half a dozen House seats by a whisker (or a suddenly discovered bunch of ballots).

But they made really sweeping gains in state legislatures, where candidate quality makes less difference. According to the National Conference on State Legislatures, Republicans gained about 125 seats in state senates and 550 seats in state houses -- 675 seats in total. That gives them more seats than they've won in any year since 1928.

Republicans snatched control of about 20 legislative houses from Democrats -- and by margins that hardly any political insiders expected. Republicans needed five seats for a majority in the Pennsylvania House and won 15; they needed four seats in the Ohio House and got 13; they needed 13 in the Michigan House and got 20; they needed two in the Wisconsin Senate and four in the Wisconsin House, and gained four and 14; they needed five in the North Carolina Senate and nine in the North Carolina House and gained 11 and 15.

All those gains are hugely significant in redistricting. When the 2010 Census results are announced next month, the 435 House seats will be reapportioned to the states, and state officials will draw new district lines in each state. Nonpartisan commissions authorized by voters this year will do the job in (Democratic) California and (Republican) Florida, but in most states it's up to legislators and governors (although North Carolina's governor cannot veto redistricting bills).

Republicans look to have a bigger advantage in this redistricting cycle than they've ever had before.