Why was Charles Gibson chosen to interview Sarah Palin?

Why was Charles Gibson chosen to interview Sarah Palin? This morning, a blurry picture is emerging over why the McCain team choose Charles Gibson as the journalist to interview Mrs. Palin.  It was apparently decided at the very top (which means Rick Davis and a handful of others) and it was a process of elimination. While

McCain and Able: How the GOP lost the evangelicals in 2008 and put Obama in the White House

  “For the Lord had regard for Obama and his offering but he did not have regard for McCain and his offering.” When the McCain-Davis-Black team accepted and then publicly repudiated the recent endorsement of evangelical Christian leaders they broke one of the most powerful laws of modern political life.  You can’t attack evangelical leaders