Cause & effect: Why gerrymandering is a root cause of so many ills in the US Congress & state legislatures

[UPDATE: Most people yawn at the issue of gerrymandering, but I think it is a critical problem. I drew this chart partly to clarify the issue in my own mind and partly to illustrate for others how pernicious and damaging gerrymandering really is.]

Click on the image to see a larger version.