Amid calls for President Joe Biden to withdraw as a candidate in the 2024 presidential election, many people are drawing comparisons to 1968, when President Lyndon B. Johnson declined to run for reelection, citing conflicts caused by the Vietnam war, violent inner-city protests, and widespread poverty. Johnson’s vice president, Hubert Humphrey, earned the nomination and ended up losing to Richard Nixon, the Republican nominee. On July 18, the X account for MSNBC’s Morning Joe posted a clip of hosts Joe Scarborough and Mika Brzezinski discussing the 1968 election. Nikole Hannah-Jones, an investigative reporter for the New York Times Magazine and...