Why did so many Democrats run for president in 1972 (when Nixon was popular and the economy was good)?

four years later in 1976 they had another crowded field; that one made sense because that was post-Watergate and Ford was still associated with a scandal-prone Nixon administration. but explain 1972??? was there a perception that Nixon was "beatable?" His approval rating was like in the 60's? I... show more four years later in 1976 they had another crowded field; that one made sense because that was post-Watergate and Ford was still associated with a scandal-prone Nixon administration.

but explain 1972???
was there a perception that Nixon was "beatable?" His approval rating was like in the 60's?
I don't understand.
4 answers 4