Some years ago, the city of Chicago created an additional tax on the sales of new cars. They then went to dealers in the neighboring cities and towns and told them that they had to collect this tax from Chicago residents that bought a car in these dealerships.
I cannot use the words that the dealers used, but the tax was removed at the behest of the Chicago car dealers' association as unfair to the Chicago dealers.
A tax on internet sales would have to be a federal tax, since a state has only jurisdiction on its own residents. Any thinking person should see that a federal sales tax would be a new tax ability for the feds, and why would anyone want that?