Gingrich shines with 'food stamp president' line, according to Twitter

Gingrich also had strong moments when he criticized extending unemployment benefits, and expressed his support for the killing of Osama Bin Laden.

A low moment for Gingrich came when he defended his negative ads about front-runner Mitt Romney's work at financial firm Bain Capital.

Romney generated the most Twitter traffic overall, but most of it rated his answers as "dodges." 

Twitter users credited Rick Perry for his answer on immigration, but rated Ron Paul as dodging questions on foreign policy.