In 1860, it's arguably the most important presidential election in American history, with a four way race that literally ends up tearing the country apart.
The country is still at war with itself or each other, however which way you look at it. A general Lincoln fires after the Battle of Antietam comes back to challenge him for the Presidency.
It's Grant versus a vegetarian who looks like a lion. Oh yeah, and it's the first presidential election (if not only) in which a woman runs with an African American.