"The FCC is directed by five commissioners appointed by the U.S. president and confirmed by the U.S. Senate for five-year terms, except when filling an unexpired term. The president designates one of the commissioners to serve as chairman. Only three commissioners may be members of the same political party. None of them may have a financial interest in any FCC-related business."
--Wikipedia entry
Why they aren't all democrats, I haven't a clue.