The authors write that Romney decided not to choose Chris Christie as his running-mate , in part due unanswered questions through the vetting process about a defamation lawsuit and a Securities and Exchange Commission investigation , as well as his weight . Christie and the Romney campaign later quarreled with each other , including an argument with a Romney adviser at the 2012 Republican National Convention
2012 Republican National Convention
2012 Republican National Convention
Double Down: Game Change 2012