This Talking Points Memo story pointed to a Republican State Leadership Committee REDMAP Summary Report:

REDMAP
How a Strategy of Targeting State Legislative Races in 2010
Led to a Republican U.S. House Majority in 2013:

[A]ggregated numbers show voters pulled the lever for Republicans only 49 percent of the time in congressional races, suggesting that 2012 could have been a repeat of 2008, when voters gave control of the White House and both chambers of Congress to Democrats.

But, as we see today, that was not the case. Instead, Republicans enjoy a 33-seat margin in the U.S. House seated yesterday in the 113th Congress, having endured Democratic successes atop the ticket and over one million more votes cast for Democratic House candidates than Republicans.

This document was to review

its strategy and execution of its efforts in the 2010 election cycle to erect a Republican firewall through the redistricting process that paved the way to Republicans retaining a U.S. House majority in 2012.

Right up front, there is the reason for this effort:

Controlling the redistricting process in these states would have the greatest impact on determining how both state legislative and congressional district boundaries would be drawn. Drawing new district lines in states with the most redistricting activity presented the opportunity to solidify conservative policymaking at the state level and maintain a Republican stronghold in the U.S. House of Representatives for the next decade.

So they boldly admit that their major effort was to dilute democracy by essentially putting all the undesirables in enclaves such that they are dramatically underrepresented in the House of Representatives essentially in perpetuity. The brilliance of this is that there is no undoing it so long as the media can be counted on to portray any outcry as Democrat whining. It’s a good thing the filthy wogs are underrepresented in Congress, or something might be done about this. Of course, one can always resort to sneaking in a vote to redistrict during a long-planned absence of a key Negro. An aging civil rights veteran attended the Inauguration ceremony of a black President on the Martin Luther King, Jr. holiday, only to have all the people of a certain kind lumped together (segregated, if you will) in order to insure they didn’t “muddy the waters” (if you know what I mean) of the more -ahem- reliable districts.