So much rides on who has the majority on the Supreme Court that I have worried about the left using violence to get their way there. Of course it might be disguised like a lot of the Clintons' Arkancides were, as supposedly natural causes (Jim McDougall) or an "accident" (Ron Brown).
The danger may be greater after the election, if Obama wins--if there was a vacancy before November the Republicans in the Senate might be able to delay a vote (unless they caved).