I said no, although this saying could apply:
The most important election is the next one.1864: Even bigger stakes.
Those were my two choices for the most important U.S. presidential elections ever. Great minds think alike, gentleman. Although 1968 is also up there and remains the most interesting election to me personally.
Funny about 1968: it was hotly contested but I don't think there was an appreciation for how much that election changed things then as opposed to 20 years after it happened or even today.