Was the Pentagon's exclusion of Obama foreign policy advisor Maj. Gen. Scott Gration, USAF (Ret.) from Barack Obama's planned visit with wounded troops at Landstuhl Regional Medical Center in Germany the reason for Obama's cancellation of the visit?Piecing together the information being reported in various news outlets points in that direction.Der Spiegel first reported the story in a brief note on their live thread on Obama's visit to Berlin yesterday morning (EDT). Free Republic was the first to pick up the story. From there it was picked up by Hot Air, then spread through the blogosphere and into the the...