I don't know what Drudge has, but you seem to be confusing IMs and emails, again. The Democrats were the only ones who knew of the IMs before this month.
I don't know who knew. All that seems clear is that the boy gave these IMs as proof against Foley years ago. (they're both republicans and so what?)
Drudge has an article (posted here on FR)
http://www.freerepublic.com/focus/f-news/1713788/posts
that proves that the technique of leaking this story was a total set up, supposedly to protect minors from sexual predators, but really a fake blog to leak this story 'innocently.'