This sources isn't all that geat since it doesn't mention the State of residence of several of the notable perps., but I think yo are riht. They pretty much come from all over the US. Maybe sligghtly more representative of the Red States, but there are still people from fiercly Blue States too. Not uniform at all indeed.
So far, I have counted Arizona, Arkansas, Florida, Tennesse, two guys from New York, Georgia, West Virginia, Michigan, Alabama, Washington State. It's a pretty divers bunch. I would have expected more women though. The only notable ones mentionned in the pres were both killed I believe (one shot the bodyguards of Pence and the other trampled to death by the crowd I heard).