Louis Jacobson at PolitFact:
By now, most of us are used to living in "unprecedented times." But just how unprecedented is Joe Biden’s decision to drop out of the 2024 presidential race a little more than three months before Election Day?
Occasionally, incumbent presidents have decided to not seek reelection. But dropping out midcampaign is incredibly rare. And it has never happened this close to an election.
...
The two closest political shake-ups to Biden’s were withdrawals by President Harry S. Truman before the 1952 election and President Lyndon B. Johnson before the 1968 election.
Both Truman and Johnson had assumed office following a president’s death and served a full term of their own; they each would have been eligible to run for a second full term had they wanted to. But following poor showings in each of their respective New Hampshire primaries in 1952 and 1968, both exited the race.
Truman withdrew his name from the presidential election on March 29, 1952, or 220 days before Election Day. Truman, who was suffering from low popularity amid the Korean War, dropped out less than three weeks after losing the New Hampshire primary. (In that era, there were relatively few primaries; in many states, party insiders controlled the nomination process.)
Ultimately, Adlai Stevenson II won the Democratic nomination but lost in the general election to Dwight Eisenhower, a five-star U.S. Army general from World War II who ran as a Republican.
Johnson dropped out of the race March 31, 1968, 219 days before the election. Johnson — who had become broadly unpopular because of another war, Vietnam — had not formally filed to run, and was on the New Hampshire ballot only as a write-in. But after a poor showing, and facing primary challenges from two strong contenders, Eugene McCarthy and Robert F. Kennedy, Johnson dropped out.
In the end, Johnson’s vice president, Hubert Humphrey, was nominated but lost the general election to Richard Nixon.
Biden’s move is far closer to Election Day — 107 days — and comes after all Democratic voters have had their say in the presidential primaries.
