| 2022 | Democratic | 681,856 | 55.1% | | | Republican | 554,678 | 44.9% | |
| 2018 | Democratic | 746,806 | 55.1% | | | Republican | 585,510 | 43.2% | | | Other | 23,525 | 1.7% | |
| 2014 | Democratic | 538,280 | 52.3% | | | Republican | 473,752 | 46.0% | | | Other | 17,458 | 1.7% | |
| 2010 | Democratic | 577,547 | 53.6% | | | Republican | 459,474 | 42.6% | | | Other | 41,317 | 3.8% | |
| 2006 | Democratic | 651,150 | 64.4% | | | Republican | 320,520 | 31.7% | | | Other | 39,115 | 3.9% | |
| 2002 | Democratic | 577,851 | 62.2% | | | Republican | 338,613 | 36.4% | | | Other | 12,651 | 1.4% | |
| 1998 | Democratic | 501,266 | 56.7% | | | Republican | 373,337 | 42.2% | | | Other | 9,207 | 1.0% | |
| 1994 | Democratic | 529,709 | 54.7% | | | Republican | 439,473 | 45.3% | |
| 1990 | Democratic | 489,095 | 51.0% | | | Republican | 470,206 | 49.0% | |
| 1986 | Democratic | 507,662 | 54.5% | | | Republican | 418,590 | 44.9% | | | Other | 5,057 | 0.5% | |
| 1982 | Democratic | 543,836 | 53.0% | | | Republican | 470,435 | 45.8% | | | Other | 12,409 | 1.2% | |
| 1978 | Democratic | 578,836 | 58.8% | | | Republican | 405,347 | 41.2% | | | Other | 53 | 0.0% | |
| 1974 | Democratic | 620,556 | 59.0% | | | Republican | 414,052 | 39.4% | | | Other | 16,497 | 1.6% | |
| 1970 | Democratic | 521,178 | 49.3% | | | Republican | 536,875 | 50.7% | | | Other | 17 | 0.0% | |
| 1966 | Democratic | 545,209 | 55.2% | | | Republican | 441,789 | 44.8% | | | Other | 29 | 0.0% | |
| 1962 | Democratic | 553,946 | 53.7% | | | Republican | 477,636 | 46.3% | | | Other | 12 | 0.0% | |
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