There's no law banning parties from campaigning on election day. The only thing they can't do is loiter inside polling stations in an effort to influence your vote. Nonetheless, convention has dictated that the campaigning winds up the day before.
That seems to be changing. Lib Dems in at least one key marginal were out delivering "good morning" leaflets early today, and an email from John Prescott arrived in Labour supporters' inboxes just after the polls opened.
"It doesn't take long to scrap, cut and destroy!" the deputy PM warned waverers. " The Tories could wreck many of Labour's achievements in a few short months. Even though the polls show Labour in front, it doesn't mean we'll win. When I was elected to Parliament in 1970, we were 16 points ahead and everyone assumed Labour had it in the bag. But we lost."
Incidentally, TV broadcasters are normally barred from filming inside polling stations on polling day - though officials sometimes make an exception when the party leaders arrive.
