During a recent weekend in North Carolina, Tim Pawlenty did what he has been doing over the past year for Mitt Romney: He drove himself non-stop. In one town, he discussed the economy and jobs with a group of parents at an ice rink. Before the event ended, the former high school junior varsity hockey player had taken to the ice to give children a few skating tips. Soon, he was off again. He helped to open a Republican office in Raleigh, turning fiery, using the occasion to hammer President Obama and show off his combative skills: “I’m tired of hearing his teleprompter speeches and no results. . . . Those words, they don’t put gas in our cars, do they?”