Uh, if it's in Poland, then it technically was Polish. It was just a German occupation. Plus, some Poles at that time were German sympathizers.
Anyways, big deal.
Yeah and it was during a ceremony where Obama was honoring a Polish guy so it wasn't like he was trying to diss them in any way or form.
I'd say I am surprised at this being a controversy but when you're as high profile as the President you're gonna get every word you say dissected.