Why can't the Prime Minister be straight with people?

David Cameron has called on the Gordon Brown to confirm that the Government is planning to cut public spending over and above inflation after 2010.

Speaking at Prime Minister’s Questions, David asked Mr. Brown to “be straight with the British people” and reveal his true spending plans.

He said the Prime Minister’s repeated denials are making him look “increasingly ridiculous” and concluded:

"If you cannot be straight with people, you are simply not fit to be Prime Minister.”