Tim Dower: We're now at the point where the election campaign is limping into a petty bidding war

You know you're getting down to the rats and mice when you've got a major political party promising to change speed limits, if only we'll vote for them.

Now I'm not saying National's wrong about a lot of those 30k zones especially, some of them are probably really daft but others might make sense.

I guess the point is we're down to fairly trivial stuff now and the election campaign is limping into a petty bidding war.