| 2020 | Democratic | 8,222,154 | 48.9% | | | Republican | 0 | 0.0% | | | Independent | 8,588,618 | 51.1% | |
| 2018 | Democratic | 4,828,564 | 40.3% | | | Republican | 0 | 0.0% | | | Independent | 7,167,315 | 59.7% | |
| 2016 | Democratic | 7,146,039 | 53.7% | | | Republican | 0 | 0.0% | | | Independent | 6,168,388 | 46.3% | |
| 2010 | Democratic | 3,978,314 | 53.8% | | | Republican | 0 | 0.0% | | | Independent | 3,412,387 | 46.2% | |
| 2008 | Democratic | 3,798,598 | 58.0% | | | Republican | 0 | 0.0% | | | Independent | 2,748,479 | 42.0% | |
| 2006 | Democratic | 1,916,925 | 23.0% | | | Republican | 0 | 0.0% | | | Independent | 6,400,587 | 77.0% | |
| 2004 | Democratic | 1,840,002 | 16.4% | | | Republican | 0 | 0.0% | | | Independent | 9,411,198 | 83.6% | |
| 2002 | Democratic | 3,000,154 | 42.5% | | | Republican | 0 | 0.0% | | | Independent | 4,064,648 | 57.5% | |
| 2000 | Democratic | 4,032,355 | 59.6% | | | Republican | 0 | 0.0% | | | Independent | 2,737,274 | 40.4% | |
| 1998 | Democratic | 2,935,048 | 37.5% | | | Republican | 0 | 0.0% | | | Independent | 4,888,679 | 62.5% | |
| 1996 | Democratic | 3,560,084 | 37.2% | | | Republican | 0 | 0.0% | | | Independent | 6,019,951 | 62.8% | |
| 1994 | Democratic | 3,529,432 | 41.1% | | | Republican | 0 | 0.0% | | | Independent | 5,063,537 | 58.9% | |
| 1988 | Democratic | 4,630,752 | 48.9% | | | Republican | 0 | 0.0% | | | Independent | 4,844,312 | 51.1% | |
| 1908 | Democratic | 114,024 | 56.4% | | | Republican | 0 | 0.0% | | | Independent | 87,977 | 43.6% | |
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