Why are states so eager to collect taxes on Internet sales? In short, because they could grab money from other states. Heritage legal expert David Addington lays it out: Like the money-hungry federal government, many state governments have financial and political interests in getting their hands on more and more money to grow their governments. It is not surprising that many of those state governments find out-of-state businesses to be lucrative and politically easy targets for tax legislation. Addington explains how this would work. Take, for example, a company whose workforce and warehouses are in New Hampshire. This company has...