Tough one this as it involves a different mindset...and probably a decision on whether to have a major 3rd party. Green here represents the LibDems
2005 (I doubt holding it in 2004 would have made much of a difference)
Party leaders at the time
Labour - Tony Blair
Conservatives - Michael Howard
Liberal Democrats - Charles Kennedy
If an election was held in November 2008
Labour - Gordon Brown
Conservative- David Cameron
Liberal Democrat - Nick Clegg
I'm sure someone can do far far better
It's just to prompt disussion