I've often wondered if past elections would turn out differently (besides the obvious differences in EV totals) if they were held today, taking into consideration the demographics and identities of all 50 states.
I'll start with one of my favorite elections, the election of 1824. Red for Jackson, Blue for John Quincy Adams (to keep it simple, we'll stick with two candidates).
Looks like John Quincy Adams wins, 288-250. I gave JQA (who would likely be a Hillary supporter) Oklahoma due to the large Native American population.
Now for 1860: We'll do three candidates for this one. Blue for Lincoln, Red for Breckinridge and Green for Douglas.
Lincoln still wins, 310-167-61. I gave a lot of the rural states to Douglas as I believe they would be concerned Lincoln was too pro-federal government, but would be less concerned with slavery and would support the preservation of the Union.