Looking for the name of a movie. It is about a guy hiding in a hotel in Las Vegas. Lots of hitmen are trying to get to him and kill him. Some very strange and funny stuff. The guy is a card shark. He has a HUGE party the night before, and is trying to arrange a deal with the Feds so he can come in. Does anyone know this movie title?

Although the description you are giving is a little different, I think you are talking about:
"Smokin' Aces"
http://www.imdb.com/title/tt0475394/

Smokin Aces I believe
http://www.imdb.com/title/tt0475394/