If the vote thing should come up again?
Just say something like this:
"In the last election, even if your chosen candidate didn't win, you still had a voice. That's because the party you voted for receives two dollars a year for every vote it gets. Win or lose, you make a real monetary difference. Win or lose, they have to pay attention to your issues. VOTER'S issues.
But Harper wants to take that voice away. He wants to return to a government where the highest bidders get listened to, and your issues get ignored. One where the wealthy call the shots and the voters get ignored, because the majority of votes don't make a difference.
Tell Harper that you think he's wrong, and let's preserve the voters' voice."
It's a little rough, but the point is that this public financing scheme is actually rather elegant; it ensures that parties have a real incentive to get votes, even in ridings where they aren't going to win. It would be at the heart of any real "308 riding" strategy, and would be a massive incentive for turnout if they bothered to highlight it. It's an additional voice for voters, and that's a GOOD thing. (No matter how Coyne may whine that the Liberals aren't scaring people into direct-mail donations like the Conservatives do.)
If you tell people that it's party welfare or an "entitlement", they might not buy it. But that's not what it is. It's a way of ensuring that every vote counts. And I'm sure that if you tell people that that's what it is, they'll think it's worth defending.