Fortunately, Obama has chosen to respond aggressively to this nonsense, and it may just expose the vacuity at the heart of McCain's bid for the presidency. It certainly exposes the willingness of the Republicans to try any tactic to ensure their continued hold on the White House. McCain once had a reputation as at least an honest, if sometimes bewildering politician. How rapidly that has vanished!
For a scathing indictment of the still very newsworthy Sarah Palin, incidentally, the Daily Kos has this report on her time as mayor and governor in Alaska. The Palin bomb may yet explode other way.