| 2022 | Democratic | 1,635,824 | 39.7% | | | Republican | 2,444,382 | 59.3% | | | Other | 42,753 | 1.0% | |
| 2018 | Democratic | 2,049,944 | 47.0% | | | Republican | 2,210,356 | 50.7% | | | Other | 103,471 | 2.4% | |
| 2014 | Democratic | 1,074,475 | 35.5% | | | Republican | 1,811,020 | 59.8% | | | Independent | 141,292 | 4.7% | |
| 2010 | Democratic | 1,555,696 | 41.5% | | | Republican | 2,013,667 | 53.7% | | | Other | 182,977 | 4.9% | |
| 2006 | Democratic | 2,104,010 | 55.0% | | | Republican | 1,546,417 | 40.4% | | | Other | 172,771 | 4.5% | |
| 2002 | Democratic | 1,256,428 | 40.7% | | | Republican | 1,827,995 | 59.3% | |
| 1998 | Democratic | 1,404,081 | 44.0% | | | Republican | 1,789,105 | 56.0% | | | Other | 186 | 0.0% | |
| 1994 | Democratic | 1,150,460 | 35.2% | | | Republican | 2,116,258 | 64.8% | |
| 1990 | Democratic | 1,604,058 | 47.0% | | | Republican | 1,809,416 | 53.0% | |
| 1986 | Democratic | 1,805,833 | 59.7% | | | Republican | 1,217,803 | 40.3% | |
| 1982 | Democratic | 1,739,602 | 53.6% | | | Republican | 1,362,079 | 42.0% | | | Other | 143,943 | 4.4% | |
| 1978 | Democratic | 1,365,219 | 50.2% | | | Republican | 1,356,959 | 49.8% | |
| 1974 | Democratic | 1,343,603 | 47.9% | | | Republican | 1,462,776 | 52.1% | |
| 1970 | Democratic | 1,362,041 | 45.9% | | | Republican | 1,606,920 | 54.1% | |
| 1966 | Democratic | 1,037,710 | 38.3% | | | Republican | 1,674,600 | 61.7% | |
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