In the politics of the United States, an October surprise is a news event that may influence the outcome of an upcoming November election (particularly one for the presidency), whether deliberately planned or spontaneously occurring. Because the date for national elections (as well as many state and local elections) is in early November, events that take place in October have greater potential to influence the decisions of prospective voters and allow less time to take remedial action; thus, relatively last-minute news stories could either change the course of an election or reinforce the inevitable.[1] The term "October surprise" was coined by William Casey when he served as campaign manager of Ronald Reagan's 1980 presidential campaign.[2] However, there were October election-upending events that predated the coining of the term.[1][2]
Two-horse chariot races (bigae) were held in the Campus Martius, the area of Rome named for Mars, after which the right-hand horse of the winning team was transfixed by a spear, then sacrificed. The horse's head (caput) and tail (cauda) were cut off and used separately in the two subsequent parts of the ceremonies: two neighborhoods staged a fight for the right to display the head, and the freshly bloodied cauda was carried to the Regia for sprinkling the sacred hearth of Rome.