In the referendum this year in May there was an umbrella proponent group for electoral reform, BC-STV, and there was an opponent group. They were both funded, and this was a first in British Columbia referenda. There was also the ability for other groups to form as registered referendum advertisers, but there wasn't a lot of that.
Most of the community that was interested in this gravitated to the proponent and opponent groups and funded them and assisted their efforts in getting the message out on the two sides of the referendum debate.