Gambling is a sin. Here are some resources for you:

http://www.peapac.org/guide_98/98_sb_gambling.asp
http://www.biblestudyguide.org/bible...s/gambling.htm
http://www.rpc.org/morals/gambling.htm
http://www.christiananswers.net/q-acb/acb-g001.html

So, I guess the real question, then, is whether you care more about what God says, or playing poker. Easy choice for me.