Truman and Johnson Also Stepped Aside, but the Circumstances Are Quite Different'
Briefly

Only two Democratic presidents in the last 75 years chose not to run for re-election during an election year, resulting in subsequent Democratic nominees losing the general election to Republicans.
Truman and Johnson withdrew from their races in the midst of primary season due to challenges ending unpopular wars, specifically Korea for Truman and Vietnam for Johnson.
Truman's declining popularity in 1952, attributed to U.S. military involvement in Korea and corruption scandals, led to his decision not to seek a third term despite not being subject to the 22nd Amendment.
Read at www.nytimes.com
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