That Arizona representative made the decision a few days ago, and here's a fitting tribute:

When someone retires or passes away, we try to say something nice about that person, we downplay his negatives and point out his positives. I would like to do the same for Congressman Jim Kolbe, but I really don't have the time to do that much research, other then to say, I wholeheartedly approve of his decision to leave Congress.

A possible replacement is Randy Graf, who, unlike Kolbe, is opposed to illegal immigration. Kos thinks that district is a potential opening for the Dems. The WSJ-wing of the GOP would probably be willing to let a Dem win rather than help elect someone who wants to stop the illegal labor. Hopefully Graf will be able to show that they're both wrong.