Why did president johnson decide not to run for reelection in 1968?

Public opposition to the Vietnam War had made him unpopular.

President Johnson was a faithful adherent of the Vietnam War but as the opportunity for the polls in 1968 appeared the citizens started investigating the US engagement in the Vietnam War and was largely objected to it. President Johnson apprehended his beliefs turned him shunned and he understood he couldn't muster adequate support and thus did not contested for election again.

i think it would be a

lol   that was   funny : >