Take a look at this screenshot of a Google Ad of a Poker forum, Google actually does accept and show ads for content which are otherwise prohibited according to the online "terms and conditions".
Answers.com definition of Poker:
Poker is fundamentally a gambling game and is played either for money or for chips purchased from the game's banker.
Google Adsense Program policies clearly states that Adsense Publishers may not put Adsense on sites that contain:
Gambling or casino-related content
Google Adwords Policy for advertisers on Gambling
Advertising is not permitted for online casinos, sports books, bingo, and affiliates with the primary purpose of driving traffic to online gambling sites.
source : http://labnol.blogspot.com/
