The amendment exactly excluded the sitting president, Harry
S Truman. Truman started a campaign for a third term in 1952, but after 18 days
he said, he would not pursue a second full period. He leave after a meagre performance
in the New Hampshire primary. The only Presidents therefore far who have attended
two full terms since the Amendment's approval are Dwight D. Eisenhower, Bill
Clinton and Ronald Reagan.
The answer is plessey vs. fergoson .