We’re quite familiar with the tactic here. In the recent health levy campaign, opponents —Citizens for Fairness — accepted contributions from the Government Policies Foundation, a social welfare non-profit (at least one source tell me he’s
been told the money actually came from a well-known private association working on alternative tax issues.)
We’ll likely never know about the contribution, though, because 501c4 donations are secret.
Secret non-profits are involved in lots of different local issues. The earnings tax, for example.