The Other McCain has a big roundup on the Arizona shooter.
Now that Loughner’s personality is coming into focus, we see that he wasn’t really into politics at all. His crime targeted a politician and, once he began his descent into madness, his online rantings had what might be called a pseudo-political aspect, but it is impossible to categorize his beliefs according to any normal political spectrum because, as I said before, “crazy” is not an ideology.
And just because you're involved in politics doesn't mean everything that happens has a political component. Or that everyone is an interested in politics as you are.