The tories have everything to lose from a TV debate.

The Liberal Democrats have been included in the debate. This demonstrates that British politics is changing from a two-party system to a third party one. More people are choosing to vote Liberal Democrat and they have become more popular over the years.

Liberal Democrat leader, Nick Clegg views the TV debate as a "very good thing." Charlie Becket in the New Statesman says "As for Nick Clegg, he will be delighted with the attention." The inclusion of the Liberal Democrats may be a sign that the two main political parties are beginning to take them seriously.

Tim Mongomerie, editor of the Conservative Home website said in the Guardian: The TV debate "will be a big boost for Nick Glegg. He will be given the status that the third party in British politics has never had before." The debate will be risky for the Conservatives as they do not want voters to view the Liberal Democrats as an alternative to voting Labour.

For Labour, the TV debate will offer an oppertunity for Gordon Brown to remind voters of the achievements of the past twelve years.

The TV debate is a huge gamble for Gordon Brown and Labour. Gordon Brown does not tend to do well on his own. In Parliament he can rely on the support of backbenchers but in the debate he will have to stand on his own. 
 
Voters view him as a "charmless man" and this may show on the TV debate, thus giving David Cameron an advantage.