Take a look at a congressional district map, and it can look like a madman's jigsaw puzzle. The reason is, in part, that the district lines are drawn by state legislators seeking to maximize partisan advantage. It's a process that critics say is responsible for much that's wrong with Washington.
That's why some states have tried setting up independent commissions to draw the map. Arizona voters created such a commission in 2000. But when the commission chair displeased the governor and state Senate, they tried, unsuccessfully, to remove her.