Johann Hari thinks that Cameron will be held captive by the more extreme elements in his party:
Cameron can tuck away the Tory Party on a poster, but he can’t tuck them away in parliament: they will be the source of his power. A leader can’t defy this Party’s core instincts for long, especially when he has (at best) a small majority. Every barking-right backbencher will have to be wooed and soothed and fed red meat to get legislation through. Cameron will be accountable to deeply retrograde forces and they will demand policies that worsen poverty or global warming or prejudice.