After losing an election at the end of a deeply unpopular four year term, Herbert Hoover spent roughly a decade outside Washington looking in as the Roosevelt administration held the White House.
Hoover, however, had many years ahead of him, given that he left office at 58. In fact, until Jimmy Carter came along, Hoover holds the record for the longest post-presidency of any man to hold the office. Hoover lived a full 32 years after he left the White House.
As he did in the White House, Hoover would spend much of his post-presidency supporting the unpopular, and often losing, side. Hoover denounced New Deal policies during the Depression. Prior to World War II, even after meeting Adolf Hitler, with whom the former president argued, Hoover called for the United States to stay out of it even after Germany invaded Poland. (He later changed his mind after the attack at Pearl Harbor.) After the war, he opposed the Truman administration's Cold War policy.