Answer and Explanation:
One of the main characteristics that John F. Kennedy presented and that did not help him to run for president was his political inexperience. He was a very charismatic figure, but very young and with little political experience. Many believed that his campaign was based more on media effects than facts about his ability to govern.
Another negative point that he presented was the involvement of big names in the mafia, not only in his campaign, but also in the formation of the Kennedy family fortune, which had a great involvement in smuggling.
Finally, John F. Kennedy was famous for being unfaithful to his wife, which tarnished his reputation in a big way, mainly because his wife was a beloved figure by the Americans. In addition, cases of infidelity weaken the image of a great leader, as the president should be.