Romney may be "convenient Mitt", willing to lie to win. But Obama supporter Andrew Sullivan rightfully blames POTUS for his big drop in the polls

Andrew Sullivan: 

And if you were a low-information voter and watched the first debate with one man with energy and ideas (however deceptive) against a president who looked like he was making small talk with a bore at a cocktail party, you'd pick the challenger yourself. It turns out it wasn't the economy (it's been perking up lately) that's become the main challenge for Obama. Nor the Electoral College. Nor a motivated, radical GOP base. It turns out that the main challenge for Obama's re-election in the final stretch is Obama himself.