Who was the only president never actually elected to either the office of president or vice-president?

The thirty-eighth president never expected to work in the Oval Office. His first promotion came when Richard Nixon's vice-president, Spiro Agnew, resigned amid a bribery scandal in 1973. A year later, Nixion resigned due to the Watergate scandal. After Nixon resigned in disgrace, Gerald Ford took over the reins of government.