| 2018 | Democratic | 1,814,499 | 47.0% | | | Republican | 1,944,963 | 50.4% | | | Independent | 102,163 | 2.6% | |
| 2014 | Democratic | 1,050,883 | 41.7% | | | Republican | 1,382,551 | 54.9% | | | Independent | 86,427 | 3.4% | |
| 2010 | Democratic | 1,079,716 | 42.4% | | | Republican | 1,368,289 | 53.8% | | | Other | 96,549 | 3.8% | |
| 2006 | Democratic | 713,324 | 34.4% | | | Republican | 1,357,770 | 65.6% | |
| 2002 | Democratic | 657,754 | 33.2% | | | Republican | 1,274,831 | 64.3% | | | Other | 51,441 | 2.6% | |
| 1998 | Democratic | 651,891 | 37.7% | | | Republican | 1,017,602 | 58.9% | | | Other | 59,170 | 3.4% | |
| 1994 | Democratic | 725,134 | 49.0% | | | Republican | 754,123 | 51.0% | |
| 1990 | Democratic | 712,736 | 51.3% | | | Republican | 676,486 | 48.7% | |
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