| 2020 | Democratic | 250,860 | 41.6% | | | Republican | 328,548 | 54.4% | | | Other | 24,200 | 4.0% | |
| 2016 | Democratic | 255,933 | 50.2% | | | Republican | 236,115 | 46.4% | | | Other | 17,312 | 3.4% | |
| 2012 | Democratic | 236,450 | 48.9% | | | Republican | 228,879 | 47.3% | | | Other | 18,160 | 3.8% | |
| 2008 | Democratic | 319,625 | 65.4% | | | Republican | 159,000 | 32.5% | | | Other | 9,941 | 2.0% | |
| 2004 | Democratic | 225,016 | 50.4% | | | Republican | 205,313 | 46.0% | | | Other | 15,817 | 3.5% | |
| 2000 | Democratic | 193,131 | 47.1% | | | Republican | 209,135 | 51.0% | | | Other | 7,926 | 1.9% | |
| 1996 | Democratic | 84,407 | 20.8% | | | Republican | 320,768 | 79.2% | |
| 1992 | Democratic | 198,421 | 48.7% | | | Republican | 209,401 | 51.3% | |
| 1988 | Democratic | 169,313 | 45.9% | | | Republican | 192,604 | 52.2% | | | Other | 7,104 | 1.9% | |
| 1984 | Democratic | 266,578 | 70.3% | | | Republican | 100,070 | 26.4% | | | Independent | 12,322 | 3.3% | |
| 1980 | Democratic | 199,574 | 55.4% | | | Republican | 160,892 | 44.6% | |
| 1976 | Democratic | 195,420 | 61.7% | | | Republican | 115,848 | 36.6% | | | Other | 5,452 | 1.7% | |
| 1972 | Democratic | 172,523 | 54.1% | | | Republican | 146,231 | 45.9% | |
| 1968 | Democratic | 150,481 | 54.1% | | | Republican | 116,432 | 41.9% | | | Other | 11,199 | 4.0% | |
| 1964 | Democratic | 136,862 | 48.7% | | | Republican | 144,113 | 51.3% | |
| 1960 | Democratic | 125,651 | 44.9% | | | Republican | 154,230 | 55.1% | |
| 1932 | Democratic | 104,949 | 48.5% | | | Republican | 101,105 | 46.7% | | | Independent | 6,317 | 2.9% | | | Other | 4,010 | 1.9% | |
| 1928 | Democratic | 114,256 | 58.6% | | | Republican | 79,777 | 41.0% | | | Other | 779 | 0.4% | |
| 1912 | Democratic | 25,381 | 31.8% | | | Republican | 22,950 | 28.8% | | | Independent | 18,881 | 23.7% | | | Other | 12,566 | 15.8% | |
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