Should Clegg be watching his back?

I've just been listening to Any Questions? on Radio 4.  Despite it being less enjoyable than when Jonathan Dimbleby is on holiday it was interesting.  It put a question back into my head.  Should Nick Clegg be watching his back?  Chris Huhne was one of the panel and it was put to him that Clegg had not approached this week's vote on a referendum on principle. He was reminded that Clegg had told the Today programme that the LibDem approach would depend on the arithmetic.  Huhne responded that Clegg had said this "before it was discussed." It was said in the rather patronising style that Chris Huhne has mastered to perfection.  Chris Huhne is ruthlessly ambitious.  Indeed a LibDem Councillor in Eastleigh told me in 2004 that Mr Huhne had told them that he would be the next leader after Kennedy - before he had even entered Parliament.  With the tight result of the leadership election between Clegg and Huhne I have no doubt that Chris Huhne still regards his leadership ambitions as very much 'in play'.  If I were Nick Clegg I'd be watching my back.