According to an article in the Seattle Times, at a shareholder meeting on Tuesday Amazon CEO Jeff Bezos expressed support for the Main Street Fairness Act (without mentioning it by name):
Bezos reiterated his support of federal efforts to minimize the many differences among states on sales-tax collection from Internet retailers. Asked by one shareholder to look ahead 10 years, Bezos said, “I believe we’ll have the simplified sales-tax initiative passed.”
“I hope it might happen much sooner than that,” he added. “It’s the right thing to do, and I think it would be great for Amazon.”
However, he reiterated that Amazon is opposed to state-by-state legislation attempting to require online retailers to collect sales tax.
One clarification: It may be difficult to understand from the article that sales tax is already due on online sales. Currently the consumer is required to send the tax due directly to the state if the retailer doesn’t collect it.
The Main Street Fairness Act would allow states that have adopted sales tax simplification measures (thus making it easy for retailers to collect sales tax for multiple states) to require online retailers to collect sales tax.