| 2020 | Democratic | 8,885,569 | 52.0% | | | Republican | 0 | 0.0% | | | Independent | 8,213,054 | 48.0% | |
| 2016 | Democratic | 5,070,772 | 36.9% | | | Republican | 0 | 0.0% | | | Independent | 8,663,159 | 63.1% | |
| 2010 | Democratic | 4,935,355 | 59.6% | | | Republican | 0 | 0.0% | | | Independent | 3,342,710 | 40.4% | |
| 2008 | Democratic | 3,858,363 | 57.2% | | | Republican | 0 | 0.0% | | | Independent | 2,886,605 | 42.8% | |
| 2006 | Democratic | 3,218,657 | 38.6% | | | Republican | 0 | 0.0% | | | Independent | 5,112,142 | 61.4% | |
| 2004 | Democratic | 1,870,146 | 16.7% | | | Republican | 0 | 0.0% | | | Independent | 9,334,852 | 83.3% | |
| 2002 | Democratic | 2,925,223 | 40.9% | | | Republican | 0 | 0.0% | | | Independent | 4,222,946 | 59.1% | |
| 2000 | Democratic | 5,230,734 | 72.2% | | | Republican | 0 | 0.0% | | | Independent | 2,017,425 | 27.8% | |
| 1998 | Democratic | 2,186,572 | 28.9% | | | Republican | 0 | 0.0% | | | Independent | 5,368,288 | 71.1% | |
| 1996 | Democratic | 4,388,733 | 45.4% | | | Republican | 0 | 0.0% | | | Independent | 5,268,462 | 54.6% | |
| 1988 | Democratic | 4,500,503 | 49.3% | | | Republican | 0 | 0.0% | | | Independent | 4,628,737 | 50.7% | |
| 1908 | Democratic | 92,556 | 50.0% | | | Republican | 0 | 0.0% | | | Independent | 92,558 | 50.0% | |
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