Why NOW???

First, the Sunday before the election, we get Obama stating he will bankrupt the coal industry and raise electricity prices, and today we finally get Sarah Palin cleared of any ethics violations or wrongdoing in the "Troopergate" non-scandal.

Of course, this could not have been released (or made public by the MSM) say, oh, a week ago?

Ok, I get that the clearing of Palin's name was only made official today...but can anyone tell me (beyond their own bias) why the San Francisco Chronicle would keep those Obama tapes from being released?