Interesting Throat clue

A reader drew my attention to this site, which offers a fascinating new clue to the Deep Throat mystery.

Ben Bradlee once said that we could figure out who Throat is if we checked who was in the DC area on the dates specificed in Woodward's book. As it turns out, the McGovern campaign -- which was, of course, travelling all over the country -- was in the area on the days in question.

So the question is: Who inside the Democratic campaign would have inside knowledge of doings in the Nixon White House?