Why do flies continue to attack Pres. Obama?

He was speaking today being menaced by a fly.. At one point it landed squarely on his four head. But it is not the first time he has been attacked by the insect, there just seems to be something very strange about President Obama and how flies are attracted to him.. I’m sure someone in the paranormal or conspiracy world will say it is a sign that he is the beast or the antichrist.. Maybe he just needs to wash his face?