That depends on what your definition of wrong is.
Kerry is so brilliant that even when he is definitively wrong, he is actually right; in some nuanced way that Kerry alone understands.
As for us commoners, it is not our place to judge our betters.
He said Bush has spent $200,000,000 on Iraq; he is wrong, according to none other than Brian Williams.
The total is $119,000,000, which includes Afghanistan -- and some of it hasn't been spent at all.