Watching that clip, and recalling Beck having previously entertained the notion that President Obama might be the antiChrist, I was left with the impression that Beck is suggesting that Obama is attracting flies, bees, and rodents because he is an agent of Satan.
That is precisely what he means (although he delivers his dog whistle for antiChrist fearing, New World Order conspiracists in the form of levity.) This site notes that Beck read to his radio audience "most of" this post:
Obama, the Lord of the Flies.
Did you know that ”Lord of the Flies” is the literal meaning of the Greek word (βεελζεβούβ) for Beelzebub?
So who is Beelzebub? Beelzebub — derived from Ba‘al Zebûb, a Semitic deity worshipped in the Philistine city of Ekron – is the name of one of the seven princes of Hell. Beelzebub was used by the later Christians as a term for Satan.