Some experts are calling it a tie, while snap polls anoint President Obama as the winner. But the more accurate reading of the second presidential debate is to say simply: Mitt Romney lost. Yes, Obama was “much improved” as one CNN pundit put it, but his re-energised avatar would have been less impressive without Romney’s help. The former governor of Massachusetts committed five key unforced errors that determined the outcome of the debate, each revealing a different (and un-electable) Mitt Romney.