2021	Democratic	706,778	12.8%
	Republican	3,563,867	64.5%
	Other	1,257,574	22.7%

2018	Democratic	7,721,410	61.9%
	Republican	4,742,825	38.1%

2014	Democratic	4,388,368	60.0%
	Republican	2,929,213	40.0%

2010	Democratic	5,428,458	53.8%
	Republican	4,127,371	40.9%
	Other	539,656	5.3%

2006	Democratic	3,376,732	38.9%
	Republican	4,850,157	55.9%
	Other	452,527	5.2%

2003	Democratic	2,724,852	31.5%
	Republican	4,206,217	48.6%
	Independent	1,161,264	13.4%
	Other	565,470	6.5%

2002	Democratic	3,533,490	47.3%
	Republican	3,169,801	42.4%
	Other	770,739	10.3%

1998	Democratic	4,858,817	58.0%
	Republican	3,216,749	38.4%
	Other	306,305	3.7%

1994	Democratic	3,519,799	40.6%
	Republican	4,781,766	55.2%
	Other	363,810	4.2%

1990	Democratic	3,525,197	45.8%
	Republican	3,791,904	49.2%
	Other	382,366	5.0%

1986	Democratic	2,781,714	37.4%
	Republican	4,506,601	60.5%
	Other	155,170	2.1%

1982	Democratic	3,787,669	48.1%
	Republican	3,881,014	49.3%
	Other	207,652	2.6%

1978	Democratic	3,878,812	56.0%
	Republican	2,526,534	36.5%
	Independent	377,960	5.5%
	Other	137,967	2.0%

1974	Democratic	3,131,648	50.1%
	Republican	2,952,954	47.3%
	Other	163,468	2.6%

1970	Democratic	2,938,607	45.1%
	Republican	3,439,664	52.8%
	Other	131,801	2.0%

1966	Democratic	2,749,174	42.3%
	Republican	3,742,913	57.7%

1962	Democratic	3,037,109	51.9%
	Republican	2,740,351	46.8%
	Other	75,810	1.3%

1958	Democratic	3,140,076	59.7%
	Republican	2,110,911	40.2%
	Other	4,790	0.1%

1954	Democratic	1,739,368	43.2%
	Republican	2,290,519	56.8%
	Other	481	0.0%

1950	Democratic	1,333,856	35.1%
	Republican	2,461,754	64.8%
	Other	480	0.0%

1934	Democratic	879,537	37.8%
	Republican	1,138,620	48.9%
	Other	311,565	13.4%

1918	Democratic	0	0.0%
	Republican	387,547	56.3%
	Independent	251,189	36.5%
	Other	49,934	7.3%

1910	Democratic	154,835	40.1%
	Republican	177,191	45.9%
	Independent	47,819	12.4%
	Other	5,868	1.5%

1890	Democratic	117,184	46.4%
	Republican	125,129	49.6%
	Other	10,144	4.0%