When Gov. Brian Sandoval’s staff started placing pins in the map of every Nevada town he has visited since he first started campaigning, they underestimated the amount of pins they would need. “We ran out of pins at 100 places,” Sandoval told a group of Empire Elementary School fourth-graders Tuesday. The governor visited the school in response to a letter from students, asking him to explain the election process. After introducing himself to the group and telling them a little about his job, he opened it up to questions — press conference style. “Is it hard to govern the whole …