What's Douglas Carswell hanging around for?

A very good question put to the Prime Minister by well known Tory backbench MP Douglas Carswell was met with derision by David Cameron earlier. As Carswell pressed his Party Leader on the question of the Whitehall machine dictating and driving policy instead of elected representatives, Cameron chuckled and told him to get a sense of humour.

It was a serious slap in the face to what was not a Punch & Judy question, but a serious point on how this country is governed.

Carswell, one of the big Tory thinkers who is also openly anti-EU, must surely be questioning if he is in the right Party. People can say that he might lose his seat if he defected to UKIP - but is being banned from your Party's front bench (by being anti-EU) and laughed at when you put a question at PMQs really worth hanging around for?