Those states are Delaware, Montana, Nevada and Oregon. The Federal Wire Act and PASPA combine to prohibit both online and offline USA based sports betting. The exception is in four specific states that are exempted from PASPA's restrictions. Those states are Delaware, Montana, Nevada and Oregon. The Federal Wire Act directly prohibits online sports betting through US based businesses, and PASPA prohibits sports betting in genera outside of the four approved destinations.
The website: http://www.legalbettingonline.com/political/

* Me understanding this is not easy or clear. I do have some reading comprehension probs, so, maybe, that's the problem?
Bottom-line: We know we cannot bet the election in Nevada but what about the other 3 states mentioned? I have big doubts but it would be good to know the answer.
Thanks, for any reply.