If you’ve ever bought anything on the Internet, over the phone, or from a catalog, you might have noticed that when you buy from some stores, you don’t pay any state sales tax, but if you buy from other stores, you do. That’s because a Supreme Court decision protected out-of-state businesses from revenue-hungry states. But a new bill working its way through Congress would change all that, turning every online retailer into a sales tax collector. And that’s legislation Congress should reject.