In 2024, former President Donald Trump will face some of his greatest challenges: criminal court cases, primary opponents and constitutional challenges to his eligibility to hold the office of president again. The Colorado Supreme Court has pushed that latter piece to the forefront, ruling on Dec. 19, 2023, that Trump cannot appear on Colorado’s 2024 presidential ballot because of his involvement in the Jan. 6, 2021, insurrection. The reason is the 14th Amendment to the Constitution, ratified in 1868, three years after the Civil War ended. Section 3 of that amendment wrote into the Constitutio…