I saw this in the Herald today and it got me thinking:

If Ms Lee wins the byelection, the next person on National’s list, Cam Calder, will enter Parliament.

Correct me if I’m wrong, but electorate seats aren’t supposed to change the total number of seats a party gets (unless you win more than your party vote like the Maori party did). Labour avoided the “Vote Twyford, get Tizard” dilemma when Phil Tyford stepped aside. But the fact that the Greens will split Labours vote and give the fresh face of Melissa Lea a chance raises an interesting possibility.

If Melissa Lea wins the seat then her title will change from list MP to MP for Mt Albert, but National won’t get any extra seats in parliament. This will leave a vacant seat that Labour will have to fill by taking the next person on their list.

So is it “vote Lea get Tizzard” after all?

Update: Seems that if National wins they do get another seat – so a byelection can change the proportionality of parliament. Seems weird!