All of them, except the one too young to vote. In that case, his parents were registered democrats.
There definately is a strong pattern here.
Have any good article links regarding this by chance?
I can also remember a while back the guy that flew his plane into the IRS building in TEXAS was also a leftist.
..and the guy that shot up a few people at the Jewish community center (or was it a museum?) was a devout National Socialist.
I wondering if there is a page that documents this stuff? Maybe something to start documenting on our home pages?