Very interesting.

Wonder what all of these senators have in common? It doesn't look like party, section of the country, or left-right leanings.

Usually when you get a wide dispersed group like this, the next thing to do is look for businesses and organizations (either inside the senator's state or not) that use money and votes to heavily lobby. Wonder who would lobby for this?

Just thinking aloud. I don't mean this to be a slam of the senators -- they're incompetent enough without my slamming them -- just trying to figure out if there is a commonality.