| 2020 | Democratic | 1,243,316 | 40.4% | | | Republican | 0 | 0.0% | | | Independent | 1,834,579 | 59.6% | |
| 2016 | Democratic | 934,365 | 29.4% | | | Republican | 0 | 0.0% | | | Independent | 2,247,906 | 70.6% | |
| 2010 | Democratic | 1,254,852 | 53.4% | | | Republican | 0 | 0.0% | | | Independent | 1,096,885 | 46.6% | |
| 2006 | Democratic | 972,747 | 48.3% | | | Republican | 0 | 0.0% | | | Independent | 1,042,679 | 51.7% | |
| 2005 | Democratic | 767,844 | 43.6% | | | Republican | 0 | 0.0% | | | Independent | 994,757 | 56.4% | |
| 2004 | Democratic | 1,654,112 | 60.0% | | | Republican | 0 | 0.0% | | | Independent | 1,102,996 | 40.0% | |
| 2000 | Democratic | 1,211,390 | 51.8% | | | Republican | 0 | 0.0% | | | Independent | 1,125,766 | 48.2% | |
| 1996 | Democratic | 1,406,433 | 64.5% | | | Republican | 0 | 0.0% | | | Independent | 775,281 | 35.5% | |
| 1995 | Democratic | 526,260 | 42.1% | | | Republican | 0 | 0.0% | | | Independent | 723,297 | 57.9% | |
| 1993 | Democratic | 608,252 | 41.7% | | | Republican | 0 | 0.0% | | | Independent | 851,333 | 58.3% | |
| 1991 | Democratic | 752,354 | 49.9% | | | Republican | 0 | 0.0% | | | Independent | 756,653 | 50.1% | |
| 1977 | Democratic | 471,031 | 50.0% | | | Republican | 0 | 0.0% | | | Independent | 470,147 | 50.0% | |
| 1972 | Democratic | 301,238 | 24.5% | | | Republican | 0 | 0.0% | | | Independent | 930,275 | 75.5% | |
| 1936 | Democratic | 370,140 | 79.2% | | | Republican | 0 | 0.0% | | | Independent | 97,329 | 20.8% | |
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