2018	Democratic	1,393,096	53.8%
	Republican	1,097,705	42.4%
	Other	96,486	3.7%

2014	Democratic	989,113	50.1%
	Republican	879,257	44.5%
	Independent	56,900	2.9%
	Other	50,162	2.5%

2010	Democratic	919,232	43.6%
	Republican	910,462	43.2%
	Independent	251,487	11.9%
	Other	25,840	1.2%

2006	Democratic	1,007,460	45.7%
	Republican	1,028,568	46.7%
	Independent	141,735	6.4%
	Other	25,174	1.1%

2002	Democratic	821,268	36.5%
	Republican	999,473	44.4%
	Independent	364,534	16.2%
	Other	67,198	3.0%

1998	Democratic	587,528	28.1%
	Republican	717,350	34.3%
	Independent	773,713	37.0%
	Other	13,175	0.6%

1994	Democratic	589,344	34.1%
	Republican	1,094,165	63.3%
	Other	43,885	2.5%

1990	Democratic	836,218	46.8%
	Republican	895,988	50.1%
	Other	55,957	3.1%

1986	Democratic	790,138	56.1%
	Republican	606,755	43.1%
	Other	11,211	0.8%

1982	Democratic	1,049,104	58.8%
	Republican	711,796	39.9%
	Other	24,639	1.4%

1978	Democratic	718,244	45.3%
	Republican	830,019	52.3%
	Other	37,331	2.4%

1974	Democratic	786,787	62.8%
	Republican	367,722	29.3%
	Other	98,389	7.9%

1970	Democratic	737,921	54.0%
	Republican	621,780	45.5%
	Other	5,742	0.4%

1966	Democratic	607,943	46.9%
	Republican	680,593	52.6%
	Other	6,522	0.5%

1962	Democratic	619,580	49.7%
	Republican	619,722	49.7%
	Other	7,234	0.6%

1960	Democratic	760,934	49.1%
	Republican	783,813	50.6%
	Other	5,518	0.4%

1958	Democratic	658,326	56.8%
	Republican	490,731	42.3%
	Other	10,858	0.9%

1956	Democratic	731,180	51.4%
	Republican	685,196	48.2%
	Other	5,785	0.4%

1954	Democratic	607,099	52.7%
	Republican	538,865	46.8%
	Other	5,453	0.5%

1952	Democratic	624,480	44.0%
	Republican	785,125	55.3%
	Other	9,264	0.7%

1950	Democratic	400,646	38.3%
	Republican	635,800	60.7%
	Other	10,190	1.0%

1948	Democratic	545,766	45.1%
	Republican	643,572	53.1%
	Other	21,556	1.8%

1946	Democratic	349,565	39.7%
	Republican	519,067	59.0%
	Other	11,716	1.3%

1944	Democratic	440,132	38.6%
	Republican	701,185	61.4%

1942	Democratic	75,151	9.6%
	Republican	409,800	52.2%
	Independent	299,917	38.2%

1940	Democratic	140,021	11.2%
	Republican	654,686	52.2%
	Independent	459,609	36.6%

1938	Democratic	65,875	5.8%
	Republican	678,839	60.0%
	Independent	387,263	34.2%

1936	Democratic	0	0.0%
	Republican	431,841	38.8%
	Independent	680,342	61.2%

1934	Democratic	176,928	17.0%
	Republican	396,359	38.0%
	Independent	468,812	45.0%

1912	Democratic	99,659	31.3%
	Republican	129,688	40.7%
	Independent	33,455	10.5%
	Other	55,645	17.5%

1900	Democratic	150,651	48.0%
	Republican	152,905	48.7%
	Other	10,625	3.4%