Ongoing lobby. This isn't the first iteration. This is largely sponsored by your local and favorite Wal-Mart, for the record. That corp has been lobbying hard to apply sales tax to online sales; it's their axe to grind against amazon.com. Because clearly, Wal-Mart is being injured here by "having" to charge that extra 10% for their Chinese Crap that comes in free from tariff... ooops.
Ironically, the same "logic" which supports this bill would also make it reasonable to make big box-store outlets raise their prices to make it "fair" for the mom & pop shops to be able to compete with them.
"America is at that awkward stage: It's too late to work within the system, and too early to shoot the bastards."
-Claire Wolfe
"I got a shotgun, rifle, and a four-wheel drive, and a country boy can survive."
-Hank Williams Jr.