Is there a website that offers **legal **betting/wagers on the presidential election?
If you are American, this is not legal. It is a violation of US law to gamble on an election.
The Iowa Electronic Markets can be seen as a form of gambling on elections. PredictIt has a similar market-based system, as does Intrade.
I don’t know how they get around federal law.
According to Why is it now legal to gamble on the 2016 elections?