Jeez, Liberal Democrat election literature! I know you're in favour of increased public spending on education, but that doesn't mean you should treat everyone as if they were uneducated! The size of those graph bars bear almost no relation to the numbers written on them! Besides, even if they did and all the people who voted Labour last time voted Liberal Democrat this time, it still wouldn't win your man the seat. Slightly tilting the graph to the left to foreshorten the apparent height of the Conservative bar is a less obvious but no less dishonest trick.
It's incredible how in this election each party manages to put me off wanting to vote for them whenever they're trying to win my vote.