Groups of people can not get together and buy ads to criticise their representatives within 60 days of an election. It is outrageous, not simply bad, but outrageous.
But I'm still reading, I may yet find that.
Wat I have found is that I CAN, as an individual or a group, run that ad, as long as I disclose the source and use hard money only.
IOW...I can't accept a million bucks from Smith and Wessson, the NRA, or any "entity" to buy an ad supporting a pro-second amendment candidate. I CAN put together a group of citizens and collect hard money to buy the ad.