If someone is way ahead in the opinion polls, what's the point of going out and voting for them, if it's a cold night and you'd sooner put your feet up. They're going to win anyway.

If someone is way behind, what's the point of going out and voting for them, if it's a cold night and you'd sooner put your feet up. They're going to lose anyway.

But if it's pretty even-stevens, you might just feel it's worth taking the trouble.

So the polls now are saying it's on a knife edge? Very commendable.