Which two candidates for president lost in overwhelming landslides in part because they diverged too far from the middle of the ideological spectrum?

George McGovern was a former US senator representing South Dakota. In 1972, he became the Democratic Party, presidential candidate. However, he lost the general election woefully in one of the widest landslides victories in United States election history, against Richard Nixon. The reason for his loss is attributed to being diverged too far from the middle of the ideological spectrum of the party.

Similarly, Barry Goldwater was a former US senator representing Arizona. In 1964, he became the Republican Party, presidential candidate. However, he lost the general election woefully against the Democrat Lyndon B. Johnson. One of the reasons for his loss is attributed to being diverged too far from the middle of the ideological spectrum of the party.