| 2020 | Democratic | 3,461,472 | 50.9% | | | Republican | 3,153,831 | 46.3% | | | Other | 191,293 | 2.8% | |
| 2016 | Democratic | 3,057,010 | 51.4% | | | Republican | 2,891,325 | 48.6% | |
| 2012 | Democratic | 3,125,557 | 56.1% | | | Republican | 2,313,506 | 41.6% | | | Other | 128,140 | 2.3% | |
| 2008 | Democratic | 2,619,791 | 45.7% | | | Republican | 3,002,927 | 52.4% | | | Other | 109,856 | 1.9% | |
| 2004 | Democratic | 2,621,927 | 48.3% | | | Republican | 2,730,718 | 50.4% | | | Other | 70,624 | 1.3% | |
| 2000 | Democratic | 1,991,144 | 43.1% | | | Republican | 2,495,253 | 54.0% | | | Other | 133,041 | 2.9% | |
| 1992 | Democratic | 2,187,792 | 47.6% | | | Republican | 2,313,397 | 50.4% | | | Other | 92,888 | 2.0% | |
| 1984 | Democratic | 2,259,043 | 49.1% | | | Republican | 2,287,586 | 49.7% | | | Other | 54,715 | 1.2% | |
| 1980 | Democratic | 2,035,933 | 48.2% | | | Republican | 2,155,472 | 51.0% | | | Other | 35,745 | 0.8% | |
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