Thing about the Leader's Debate (congratulations to Nick Clegg btw) is that it compounds the illusion that in a General Election the public gets to vote for the Prime Minister. This is not so. You get to vote for your MP, and only about 1 in 3 of the electorate have a real chance of affecting the outcome, the rest are in safe seats. The MPs get to choose the Prime Minister.
Reasons to gang up on the Tories #1 : they oppose electoral reform.