Because the SRM did such a good job of vetting 0 bummer. [hope I don't need a < /sarc> tag]. Remember the hoards of reporters that went to Alaska to report on made up stories on Gov Palin.?
I still think they knew all along about this. Remember the two certifications San Fran Nan signed in 2008? Something has always had a pig sty smell about that issue.
If this story is legit, look at all those on our side who each could have individually forced broader coverage: Drudge, Rush, Hannity, Levin, Beck, etc.