Here is a good article about Micon from Seals with Clubs Bitcoin Poker getting arrested. Maybe it will help your understanding of the legal standing of United States Bitcoin gambling. The government does not like to let anything get by them if they do not get a cut.

http://arstechnica.com/tech-policy/2015/03/bitcoin-poker-exec-i-was-led-out-in-handcuffs-in-my-underwear/