As of May 2014, 43 men have become president of the United States. Barack Obama is regarded as the 44th president, however, because Grover Cleveland served two nonsuccessive terms.
Only one president of the 44, Gerald Ford, was president without having been elected to the office of either president or vice president, according to the History website. He was appointed to fulfill the term of Vice President Spiro Agnew and then took over as president when Richard Nixon resigned. Eight of the 44 men have died while president, four of whom were assassinated. As of May 2014, four presidents have lost the popular vote but won the election in the electoral college. The last president in this category was President George W. Bush.