The Daily Mash has some sage campaigning advice for the Tories:

Pundits say the election contest will be the closest and most hard fought since 1992, unless the Tories abandon their existing strategy and just put up thousands of posters everywhere saying 'Ed Balls'.

Warning voters about the dangers of another five years of Ed Balls. Yes, that would probably galvanise large swathes of the electorate to flock towards the Tories...