Why are you trying so hard to NOT answer the questions?
So, the crazy guy HAS to be white???? No (I thought I did answer that one).
Ethnics? You mean like El Salvadorian, like the one lady, or hispanic, like others, or Indian as in India, like the one guy? Or do you conveniently IGNORE them? No, I mean a group of ethics, like all Black, all Mexican etc. The fact that this guy is killing all kinds of Americans says he hates Americans, and that he is not a typical American white racist.
As for the politicians, are you suggesting that the shooter is done? Or is there a chance that the shooter is not done and that perhaps politicians 'could' be targeted? I think that they would love to shoot politicians, Bushes in particular, but see little possibility of it. They accomplish almost the same thing by shooting random Americans, but might well try to finish with an attempt on Bush.