'cuz
Rev. Irwin H. Addison is a smartie...
But Chris Hussein McG. explains it better... I'm just gonna copy from his blog:
About the Hussein thing
Current mood: 
pirate
My good friend, the Rev. Irwin Addison, started the Hussein mafia. The idea is to change your middle name to Hussein. The point is that we want to counter the brain dead right wingnuts who constantly refer to Barack Obama by his full name. They think that constantly mentioning his middle name, which happens to be the same as the former leader of Iraq, will convince undecideds to vote against the Senator.Never mind that Barack was born (1961) seven years before Saddam led the coup that brought him to power (1968). Wait. I know what happened. His mom, Ann Dunham, looked into the future and decided 1) she did not want her kid to be president and 2) the best way to ensure that would be to saddle the poor kid with a name that was the same as a low-life SOB that no one in the United States would hear about until 1990. Makes sense to me.