Johann Hari in today’s Independent:

“ban opinion polls during the election campaign. Great slabs of election coverage are dominated by the horse-race: look at this Mori poll! Have you seen this Harris? People know the result of the election in advance — so they don't bother to vote. In France, they stamped this out by banning polls in the run-up to voting. It forces the media to cover the issues, and it injects suspense. Their turn-out was almost double ours”

The only argument I can think of against this idea is a rather weak libertarian one — it’s no business of the state what newspapers and broadcasters do and if they want to poll so be it. That argument needs to be stacked against the well-understood pernicious impact polling can have on turn-out and political engagement. Banning them wouldn’t be unfair to any particular party, it would (as Johann says) force the media to address issues rather than numbers and would partially negate the human tendency to ‘back a winner’ — something that might horrify us political geeks but is a factor in many peoples approach to politics.

What’s more it wouldn’t really dent the activity of polling companies — most campaigns are officially 6/8 weeks but the likely poll date is normally well known some months before that and the nature of polling in that period would probably adjust to reflect the period of abstinence coming up.

Feels like a no-brainer to me....