Obama says he visited, "57 states." 1

After hearing about this all over the internet, I was expecting it to be a lot more blame worthy than it really was...It is quite obvious that he was just tired, and I am positive that he knows how many states there are.  It also seems as if it just a lukewarm attempt at sarcasm that was miffed due to tiredness.  Awkward?  Not in the least.  It seems to me that there are so few important mistakes that he has made that people have to keep referring to this one.