If everyone followed the laws that govern their state, this Act would affect absolutely NOTHING.
The thing people have to realize is that most states require you to pay taxes on all purchases made in that state, INCLUDING online purchases (yes, you are making a purchase in a state if the computer you're using is within state lines). States simply can't require those online retailers to COLLECT those taxes for them, like regular brick and mortar stores have to do. People are supposed to report the value of online purchases in their state tax forms every year and then pay the corresponding tax on them. Of course, hardly anyone does this, which is the advantage e-tailers have.. which btw IS tax evasion by their customers. And no, just because politicians do this all the time does not make "right" for the rest of us to do it.