| 2022 | Democratic | 7,129,122 | 67.0% | | | Republican | 0 | 0.0% | | | Independent | 3,514,593 | 33.0% | |
| 2018 | Democratic | 4,417,327 | 36.6% | | | Republican | 0 | 0.0% | | | Independent | 7,662,528 | 63.4% | |
| 2016 | Democratic | 4,847,354 | 35.5% | | | Republican | 0 | 0.0% | | | Independent | 8,790,723 | 64.5% | |
| 2008 | Democratic | 3,044,099 | 44.1% | | | Republican | 0 | 0.0% | | | Independent | 3,862,808 | 55.9% | |
| 2006 | Democratic | 1,483,509 | 25.6% | | | Republican | 0 | 0.0% | | | Independent | 4,304,376 | 74.4% | |
| 2002 | Democratic | 1,294,277 | 25.9% | | | Republican | 0 | 0.0% | | | Independent | 3,704,040 | 74.1% | |
| 1998 | Democratic | 1,389,053 | 24.1% | | | Republican | 0 | 0.0% | | | Independent | 4,376,553 | 75.9% | |
| 1990 | Democratic | 2,140,634 | 44.2% | | | Republican | 0 | 0.0% | | | Independent | 2,699,393 | 55.8% | |
| 1916 | Democratic | 349,723 | 52.3% | | | Republican | 0 | 0.0% | | | Independent | 319,559 | 47.7% | |
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