Some of these are clearly incorrect. For example Kevin Costner often gets called a Republican because he supported Phil Graham in 96, but when he lost the primary, Costner switched his support to Clinton and has given it to Dems ever since. Drew Carey has publicly stated he is not voting in this election and I doubt very much that Joan (Ms. Planned Parenthood herself) Allen is a Republican.
Another incorrect one, Magic Johnson...I don't think so.
More GOPers speaking out in Hollywood
http://www.jewishworldreview.com/1004/hollywood_gopers.asp
O'Keefe's former boss, Drew Carey, is another Republican supporter in the entertainment business. "That automatically kills me for getting lots of TV shows," Carey said in a new documentary about the rising Republican tide in the entertainment industry.
being a Marine and very pro-military, i would have to think that Drew Carey would at the very least lean towards the republican party.