Business Issues: Legality of an Online Gambling Website

My question involves business law in the state of: FL

Is it legal to run a gambling website in the state of Florida that would cater to US residents?
If not, is there any other state where it is legal to run a website that caters to all US residents?
If not, is it legal to run a gambling website where there is no money being exchanged?

Thank you

Business Issues: Legality of an Online Gambling Website