Never cite proof when speculation is so much easier to come by.
They make it sound like he's a Fox News Contibutor or something instead of a member of a public forum that requires nothing more than an email address to join.
Many DU users are also convinced that Santa Clause & the Easter Bunny are real; in addition they are equally convinced that it's a good thing that DEMOCRATS WERE WARNED BY AL QAEDA THEY BETTER KEEP THEIR CAMPAIGN PROMISES TO THEM (AQ) - or else. Seems to me the Secret Service probably should check DU first before they start on the thousands of FReepers.
The proof is there if you bother to read it. Freeper Marc Costanzo is in real life Chad Castagana of Woodland Hills. A Chad Castagana of Woodland Hills was arrested for mailing white powder letters to various leftists. Now maybe there's more than one anti-leftist Chad Castagana in Woodland Hills. I seriously doubt it though.