2012 (So partisan and heated that in the incumbent LOST some of his vote, this isn't supposed to happen. And downballot, the only anomalies were Dean Heller and Deb Fischer...hell even in the face of disaster, it was taboo to shake hands)
By that standard 2004 is definitely number one:
No Candidate who won was as universally hated by the other side as Bush was in 04(Trump appealed to Rust Belt dems and Nixon appealed to Southern Dems)
The Results of each state basically stayed the same as they were in 2000(except NM , IA , and NH)
Bush was close to losing despite winning the popular vote by 3 points
The map looked like a jig saw puzzle(with dems winning the west coast , upper midwest, and the North East while GOP won everything else)
umm... just no, that is clearly an uninformed statement. Bush won 11% of Dems, a very good percentage. Kerry also won 7% of Republicans.