Harry Reid put it in there. From Hot Air:
By golly, Nancy Pelosi was right — they didn’t know what was in ObamaCare until it passed! Of course, in this case all she needed to do was ask her buddy Harry Reid, who apparently sandbagged his party’s gun-control wing by inserting an interesting clause in the 2800-page bill that no one in Congress bothered to read before voting on it. CNN’s Jim Acosta reveals the restriction on firearms-registration data collection built into the 2010 law.”
Another law to be ignored by a would-be tyrant.