Is it legal for a convicted felon to gamble in a casino?

No, this is because online gambling in the United States is legal. Some states however do have more strict guidelines when it comes to gambling online. Right now the only federal law in place pertaining to online gambling is the UIGEA where banks & financial institutions are prohibited from dealing with transactions to and from online casinos, players however have more options & deposit methods outside of their bank & financial institutions making it ok to play online.