Obama in Berlin? That was then, this is now.
“Nobody should get too hung up over President Obama’s decision, reported by Der Spiegel over the weekend, to cancel plans to attend next month’s 20th anniversary celebration of the fall of the Berlin Wall. Germany’s reunited capital has already served his purposes; why should he serve its?”
“Barack is Too Busy”

Agreed. However, this has special significance in light of all the Mao-lovers in the administration. The fall of the wall is not something to be celebrated but rather something to be mourned. I have a related commentary if you care to visit.