[ghaff]

Or states simply figure out more reasonably enforceable and appropriate revenue sources. A number of states already get by without state sales tax of any sort(1) so that's not an unreasonable option. To the degree that collecting sales tax on interstate purchases is difficult yet, perhaps, increasingly important, I'd suggest that eliminating that dependency is a better option than increased government intrusion.

Personally, I'll be sure to vote against any representative who advocates for databases of online purchases or anything in that vein.

(1) Sort of. NH, for example, does have a relatively high tax on meals eaten in restaurants.