A U.S. State Department contractor accused of snooping into the passports of presidential candidates Sen. Barack Obama and Sen. John McCain has been charged with unauthorized computer access, according to federal prosecutors.

Lawrence C.  Yontz, of Arlington, used his position at the McLean-based Analysis Corp. to peek into the electronic files of the presidential candidates as well as those of scores of celebrities, actors, media personalities, athletes and other people in the news, according to charging documents filed in the U.S. District Court for D.C.