Democrats are mad at Bill Binnie who appears in a new ad campaign (in Massachusetts) funded by an outside group. They claim the ad is illegal because the group, Americans for Responsible Health Care, is funded or supported by Binnie, and federal law apparently prohibits such things.
The Binnie connection comes from an article in the Union leader in which he is quoted as having helped form the group. [Boston.com]
The Ad buy is only 200,000.00 which pales in comparison to the 750,000 Coakley's campaign just dropped for the weekend.
As to the legality, I'm not familiar with the law, but Scott Brown has long asked outside groups to stay out of his race. He's done quite well without them, and that alone is indicative of a sea-change in opinion. Democrats are scared because the race is far too close for the Peoples Republik of Massachusetts (No 'e' at the end of Massachusetts just like there is no 'e' at the end of Potato.)
It will be interesting to see how this all works out. Maybe it's a 'living' law, and subject to wild interpretation. Perhaps there are shadows of penumbras. In any case, Brown didn't buy them, so he's off the hook.
As for Binnie. He can probably defend himself just fine, but he'd best make sure he's on the right side of the law.