Chris Huhne is looking precariously like the biter bit. The Lib Dem cabinet minister who tablethumpingly accused the Conservatives in the coalition of playing dirty in the recent referendum on the alternative Vote is himself now being accused of playing dirty. He is alleged to have asked someone to take on to their driving licence penalty points that he had accrued for a speeding offence in 2003. Mr Huhne, the MP for Eastleigh, denies the allegation. The police say they will decide this week whether to investigate the claim (see page 5).  If Mr Huhne, the Energy and Climate Change Secretary, is forced to step down, the political damage will spread far beyond his own career. Coming so soon after a damning verdict by the Parliamentary Standards Commissioner on David Laws' expenses claims, which made it clear that the former Lib Dem cabinet minister would be unable to return to the front bench any time soon, Nick Clegg would begin to look not only unlucky but lonely.  Mr Clegg, the party's leader and the Deputy Prime Minister, is doubly cursed by the actions of his colleagues. First, the wayward behaviour of a few Lib Dems threatens to taint the reputation of many. Both Mr Huhne and Mr Laws are men of outstanding intellectual ability and political talent.  Yet no politician can be trusted to run the country whom the country itself cannot trust. Whether guilty or not,