UPDATE: ArguingWithSignposts has some quotes from Democrat and CBS insiders indicating that both the Kerry campaign, which gave the memos to 60 Minutes, and CBS had doubts about their validity. Good analysis . . . take a read. CBS News has launched an internal investigation into the validity of documents related to George W. Bush’s National Guard service that it aired on 60 Minutes, according to Drudge. Other developments overnight seem to make it more likely than not that at least two of the documents were forgeries–with Killian’s signature electronically placed on a memo fabricated by Democrat operatives, then fed to CBS News.