Professional Gerrymanderers
According to this article on Slate, the redistricting effort in Texas led by Tom De Lay has resulted in the incumbent rewinning their seat 98% of the time.
“As a mapmaker, I can have more of an impact on an election than a campaign, than a candidate,” says Republican consultant David Winston, who drew House seats for the GOP after the 1990 U.S. Census. “When I, as a mapmaker, have more of an impact on an election than the voters, the system in out of whack.”