The 1978 Senate map

33 Senate contests were decided in 1978: Democrats won 15, Republicans 18. Every contest below links to its page with the state's full Senate history.

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Cycle summary

Wins by party — seats decided this cycle, not the resulting chamber balance.

Contests

33

Democratic wins

15

Republican wins

18

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Every contest

Statewide totals; candidate-level detail joins when the raw store is re-fetched with names.

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State	Won	Margin	Democratic	Republican	Total
Alaska	R	−51.7%	29,574	92,783	122,357
Alabama	D	+94.0%	547,054	0	582,005
Arkansas	D	+60.2%	395,506	84,308	517,025
Colorado	R	−18.4%	330,148	480,801	819,256
Delaware	D	+16.9%	93,930	66,479	162,072
Georgia	D	+66.3%	536,320	108,808	645,128
Iowa	R	−3.2%	395,066	421,598	824,576
Idaho	R	−36.9%	89,635	194,412	284,047
Illinois	R	−7.9%	1,448,187	1,698,711	3,184,605
Kansas	R	−11.5%	317,602	403,354	748,839
Kentucky	D	+24.1%	290,730	175,766	476,740
Louisiana	D	+100.0%	1	0	1
Massachusetts	D	+10.2%	1,093,283	890,584	1,985,700
Maine	R	−22.7%	127,327	212,294	375,114
Michigan	D	+4.3%	1,484,193	1,362,165	2,846,630
Minnesota	R	−16.2%	638,375	894,092	1,580,550
Mississippi	R	−13.5%	187,541	267,302	590,236
Montana	D	+11.4%	160,353	127,589	287,942
North Carolina	R	−9.0%	516,663	619,151	1,135,814
Nebraska	D	+35.3%	334,096	159,706	493,802
New Hampshire	R	−2.2%	127,945	133,745	263,760
New Jersey	D	+12.2%	1,082,960	844,200	1,957,515
New Mexico	R	−6.8%	160,045	183,442	343,487
Oklahoma	D	+32.6%	493,953	247,857	754,264
Oregon	R	−23.4%	341,616	550,165	891,781
Rhode Island	D	+50.2%	229,557	76,061	305,618
South Carolina	R	−11.4%	280,146	351,917	632,063
South Dakota	R	−33.7%	84,767	170,832	255,599
Tennessee	R	−15.2%	466,228	642,644	1,157,023
Texas	R	−0.5%	1,139,149	1,151,376	2,312,540
Virginia	R	−0.4%	608,511	613,232	1,221,743
West Virginia	D	+1.0%	249,034	244,317	493,351
Wyoming	D	+24.3%	82,908	50,456	133,364