Most polarizing election in the past 70 years

[Wazza [INACTIVE]]

1968:
Nixon-Democratic Senator
Alaska (Mike Gravel 45.1%)
California (Alan Cranston 51.8%)
Idaho (Frank Church 60.3%)
Indiana (Birch Bayh 51.7%)
Iowa (Harold Hughes 50.25%)
Missouri (Thomas F. Eagleton 51.0%)
Nevada (Alan Bible 54.8%)
North Carolina (Sam Ervin 60.6%)
South Carolina (Ernest Hollings 61.9%)
South Dakota (George McGovern 56.8%)
Wisconsin (Gaylord Nelson 61.7%)

Humphrey-Republican Senator
Maryland (Charles Mathias 47.8%)
New York (Jacob Javits 49.7%)
Pennsylvania (Richard Schweiker 51.9%)

Wallace-Democratic Senator
Alabama (James Allen 69.7%)
Arkansas (J. William Fulbright 59.2%)
Georgia (Herman Talmadge 77.5%)
Louisiana (Russell B. Long 100%)

2004:
Bush-Democratic Senator
Arkansas (Blanche Lincoln 55.9%)
Colorado (Ken Salazar 51.3%)
Indiana (Evan Bayh 61.7%)
Nevada (Harry Reid 61.0%)
North Dakota (Byron Dorgan 68.3%)

Kerry-Republican Senator
New Hampshire (Judd Gregg 66.2%)
Pennsylvania (Arlen Specter 52.6%)

2016:
Trump-Democratic Senator
...

Clinton-Republican Senator
...

The answer is 2016.