If you look at my handling of the supposed Bush national guard memos (aka, MemoGate), you'll see I was one of the first to acknowledge that the documents were suspicious, and I covered it as extensively as anyone else at this site.
How many of the Bush supporters have made the same effort admitting they were wrong, when they knew it made his or her candidate look bad? Draginol's handling of the disproven "secret Kerry note" debate is the only time I can remember where a Bush supporter has made anything like the effort I did on MemoGate.
I'm happy that this is finally being investigated... the Bush administration stalled on this long enough. That said, I wish I had more confidence in the impartiality of the FBI. The Bush administration has deliberately politicized parts of the government that used to be non-partisan (for example, the Civil Rights branch of the Justice Department, and now, apparently, the CIA under new Director Goss).