Thomas Dewey is best remembered as the subject of the most infamous headline gaffe in newspaper history ("Dewey Defeats Truman"), but he also serves as a cautionary tale for those who are thought to be unbeatable favorites.
Dewey was certainly considered one of those in the 1948 presidential election, and it led Dewey to think that he did not need to go out and win the election -- all he had to do was to play it safe and victory was sure to be his.
This turned out to be a mistake, as voters ended up being impressed by Harry Truman's aggressive campaign and elected him to another term as president.
Upsets of this caliber are rare and the odds that it would happen to the Heisman Trophy candidacy of Stanford Cardinal quarterback Andrew Luck, this year's heavy favorite, were probably quite slim until the Cardinal's loss to the Oregon Ducks on Saturday.
That upset has opened the door for making a powerful argument that Oklahoma State Cowboys quarterback Brandon Weeden is more deserving of the Heisman right now, and his case could end up even stronger by the end of the season.
That argument can be summed up in four points: