Charlie Mayer, NPR News
Air traffic controller Len Cushing at the Boire Field in Nashua, N.H.
Presidential candidates on the campaign trail in New Hampshire need warm coats, legions of volunteers — and air traffic controllers to guide their planes into, out of and around the state. In the months leading up to the primary, presidential candidates log countless flights through the state's airports. Air traffic controller Len Cushing, who works at Boire Field in Nashua, has this NPR Campaign Diary.