36-36-21

Today's Sky/YouGov poll puts the Tories and Labour neck and neck on 36%, with the Lib Dems 15 points behind. It's not the first poll to show the parties at level pegging, but it does signal a shift in opinion: the sample, which was taken in haste after Tony Blair announced the election date yesterday, drew on the same cohort of interviewees as an earlier poll that gave Labour a 2% lead. Intriguing. Psephologists should note that the people sampled aren't certain to vote, but YouGov's Peter Kellner believes wider surveys give a more accurate result.