By the time the elections come around, there are only 2 people who have a chance of winning, the main democrat and main republican front runners. The last time a democrat or republican didn't win an election was 1850, Millard Fillmore a member of the Whig party, which was a main political party before the formation of the new republican party. There has always been 2 main people to vote for that is on the ballet for every single state. Some times there is a 3rd independent party, but there hasn't been a 3rd party candidate elected president that I am aware of. Those who have been a 3rd party member normally got elected after changing to republican or democrat.
Name 1 candidate in the last 30 years that was not a front runner for republicans or democrats that actually stood a chance of winning and wouldn't have been a wasted vote on.