Let me get this straight: You run a gambling site (illegal in US) & plan to prosecute some_guy_on_the_internet, citing US state law? You don't see a problem here?
"The Unlawful Internet Gambling Enforcement Act of 2006 (UIEGA) did not specifically prohibit online gambling; instead, it outlawed financial transactions involving online gambling service providers."
http://en.wikipedia.org/wiki/Gambling_in_the_United_States#Legal_issuesCurrently US law say it's illegal to take credit card for payment for online gambling, it doesn't actually say online gambling is illegal. This means sites that take Bitcoin is not yet illegal until they change the law.