any links where he actually said his grandfather liberated a camp???
Here is a link that covers both comments. Note that in the earlier story of his grandfather he states that his grandfather served under Patton and “heard stories of fellow soltiers”, but evidently did not know that the Soviets were in Poland.
http://gatewaypundit.blogspot.com/2008/05/obama-repeats-auschwitz-gaffe-on.html