| 2020 | Democratic | 7,069,173 | 41.4% | | | Republican | 0 | 0.0% | | | Independent | 9,985,568 | 58.6% | |
| 2016 | Democratic | 6,104,294 | 44.8% | | | Republican | 0 | 0.0% | | | Independent | 7,516,142 | 55.2% | |
| 2008 | Democratic | 4,731,738 | 36.6% | | | Republican | 0 | 0.0% | | | Independent | 8,203,769 | 63.4% | |
| 2006 | Democratic | 3,602,055 | 43.1% | | | Republican | 0 | 0.0% | | | Independent | 4,754,868 | 56.9% | |
| 2004 | Democratic | 2,843,435 | 26.8% | | | Republican | 0 | 0.0% | | | Independent | 7,776,374 | 73.2% | |
| 2002 | Democratic | 3,084,122 | 43.4% | | | Republican | 0 | 0.0% | | | Independent | 4,024,904 | 56.6% | |
| 2000 | Democratic | 4,852,228 | 68.5% | | | Republican | 0 | 0.0% | | | Independent | 2,232,420 | 31.5% | |
| 1998 | Democratic | 3,995,668 | 53.8% | | | Republican | 0 | 0.0% | | | Independent | 3,425,341 | 46.2% | |
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