What's the point of Norman Tebbit?

As far as I can make out he is only there to prove the Tories can’t get along and will always argue and bicker amongst themselves. In an interview with the Mail on Sunday he is quoted attacking Cameron on almost every front.

It’s these kind of remarks that play exactly into Labour’s hands, providing them with the ammunition to claim “Cameron can’t take his party with him.”

I wonder if Norman Tebbit will ever realise he’s only helping Labour? I somehow doubt it.