Richard M. Johnson
Johnson captured the nation's attention after he killed Shawnee chief Tecumseh during the Battle of Thames in 1813 (he later campaigned for vice president on this achievement with the campaign slogan "Rumpsey Dumpsey, Colonel Johnson Killed Tecumseh"). The country's adoration did not last. Later dubbed "the most vulgar man of all vulgar men" by a Senate aide, Johnson scandalized his colleagues by taking one of his slaves as his common-law wife; as a result, he barely garnered enough support to serve in Martin van Buren's administration. While in office, he proposed an expedition to the North Pole so Americans could drill to the center of the Earth, believing the planet was hollow (his resolution was defeated). Evidently van Buren's experience with Johnson soured him on vice presidents altogether — when he ran for re-election he dropped Johnson from his ticket and didn't bother replacing him. Instead, he ran alone.
— M.J. Stephey