I would not have castigated Obama over this. If I am not mistaken, WWI is not history and there are no more living American veterans of WWI to honor. From that perspective, it is history like the Civil War. But there are probably still some children of veterans to pay respects to. WWI was not, IMO, the moral conflict that WWII was. It was a war over land and political entanglements brought on by an assassination. WWII had the concentration camps and treaty breaking attack on Pearl Harbor took a great number of our lives. Trump looks pretty good for his age. But at 72, if he misses an event when its raining due to logistics, I am willing to give him the benefit of the doubt. Still, it would have looked a lot better if he would have went