During his Valley Forge speech earlier this month, where he stated this election is about whether democracy would survive, President Joe Biden asked, “Is democracy still America’s sacred cause?”Biden believes former president and Republican frontrunner Donald Trump wants to end democracy while his campaign aims to preserve it. Now, Biden may be calling for democracy, but Trump is currently removed from primary ballots of Colorado and Maine. Even more, Democrats have blocked members of their own party from challenging the president in some primaries.Holding primaries and challenging a sitting president are uncommon. Historically speaking, there have been four eligible presidents who were not renominated, the last of which being in LBJ in 1968.Normally, incumbent presidents are not challenged and many states declare them winners without holding primaries. Yet, recent times are far from normal. Trump has several pending court cases. And, on the Democratic side, according to ABC News, Biden has the lowest approval ratings (about 33%) in the past 15 years. With numbers like this, it seems only right that other Democrats challenge Biden for the presidency.In at least eight Democratic state primaries, one or more candidates challenging Biden are missing from the ballot. Currently, the two leading Democratic challengers, Minnesota Congressman Dean Phillips and Marianne Williamson, author and founder of Project Angel Food, are missing from the ballot. Earlier Robert Kennedy Jr. threw his hat in the ring but when it was rejected, he decided to run as an Independent.It is difficult to call anyone a contender as Democrats have not held debates, and states are ignoring candidates on their primary ballots. Even if the Democratic Party allows these challengers to run, they will face an uphill battle, but not an impossible one.In several articles, I have said that the political craziness of 1968 is very similar to our own. When it comes to challenging a sitting president, once again, this comparison holds true.In 1968, incumbent President Lyndon B. Johnson was preparing for a second run (it would be his third term as he completed John F. Kennedy’s term after his assassination, but by law a president can serve for 10 years.)Like Biden, LBJ’s approval ratings were incredibly low, under 40%. Johnson’s biggest issue had been the war in Vietnam, which he claimed America was winning. However, 1968 began with the Tet Offensive which killed more than 2,600 American soldiers. Because of Johnson’s handling of the war, the ...