The Guardian has now come out for the LibDems, but is urging its ex-Labour and newly Libdem voters to vote tactically in some seats to secure a Labour rather than Conservative MP. Meanwhile the old LibDems, who used to vote tactically for Labour, will now vote for their own candidate even when they don't have a chance - to score a high national total vote and make a point. Conservatives in safe Labour seats will vote UKIP to make the point that Dave hasn't listened to them, and UKIP voters in Conservative marginals will vote Conservative to keep the LibDems out. In local elections, Conservatives in several London boroughs will vote LibDem to get Labour out, except in Dagenham, where they will hold their noses and vote BNP for the same reason. The Greens are expecting a vote surge following next week's pictures of oil-drenched Southern fowls that will not end up being sold as food by Colonel Sanders but this will not be tactical, but because they care, you understand.
It seems as if the only voters who won't be voting tactically in this election are those with incumbent MPs of their own party with a decent majority.