| 2022 | Democratic | 3,492,544 | 43.5% | | | Republican | 4,317,692 | 53.8% | | | Other | 222,208 | 2.8% | |
| 2018 | Democratic | 3,860,865 | 46.5% | | | Republican | 4,260,990 | 51.3% | | | Other | 183,516 | 2.2% | |
| 2014 | Democratic | 1,813,974 | 38.7% | | | Republican | 2,724,493 | 58.1% | | | Other | 147,552 | 3.1% | |
| 2010 | Democratic | 1,719,202 | 34.8% | | | Republican | 3,049,109 | 61.8% | | | Other | 167,045 | 3.4% | |
| 2006 | Democratic | 1,618,045 | 37.4% | | | Republican | 2,514,936 | 58.2% | | | Other | 188,405 | 4.4% | |
| 2002 | Democratic | 2,082,281 | 46.0% | | | Republican | 2,341,875 | 51.8% | | | Other | 99,271 | 2.2% | |
| 1998 | Democratic | 1,790,106 | 48.2% | | | Republican | 1,858,837 | 50.0% | | | Other | 65,150 | 1.8% | |
| 1994 | Democratic | 2,631,843 | 61.5% | | | Republican | 1,648,848 | 38.5% | |
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