A mature male, educated loner, with grievance against the government, who would take precautions to protect him self. This sounds like an eco-terrorist possibly another Ted Kinsinski who is a flaming liberal that shares the same views as Al Gore.
The obvious question, is Al Gore under investigation? Considering the Supreme Court Building was closed down because of Anthrax contamination, I do not believe this question is out of line. Who else has a bigger grievance against the Supreme Court?