Moving to Yes

This is the kind of thing I've now seen loads of times. There's an audience and a vote of who's Yes, No or don't know. There's then a debate. After that, there's a fresh vote. I have never yet seen there be anything but a big swing to yes. At Abertay, there were 200 first year students. Before the debate, 59% were No and 21% Yes. After it, 51% were Yes and 38% No. That's a 25% swing.

I have never - not once - read of the opposite happening: of the No vote increasing after a debate. When people hear the arguments and engage in the debate, they move to Yes.