The 2010 Senate map

36 Senate contests were decided in 2010: Democrats won 12, Republicans 23, independents and others 1. 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

36

Democratic wins

12

Republican wins

23

Other wins

1

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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	O	−12.1%	60,045	90,839	255,421
Alabama	R	−30.5%	515,619	968,181	1,483,800
Arkansas	R	−21.0%	288,156	451,618	779,581
Arizona	R	−24.3%	592,011	1,005,615	1,702,326
California	D	+10.0%	5,218,441	4,217,366	10,000,093
Colorado	D	+1.6%	851,590	822,731	1,772,190
Connecticut	D	+9.3%	605,204	498,341	1,152,443
Delaware	D	+16.6%	174,012	123,053	307,367
Florida	R	−28.7%	1,092,936	2,645,743	5,411,016
Georgia	R	−19.3%	996,516	1,489,904	2,555,170
Hawaii	D	+53.2%	277,228	79,939	370,583
Iowa	R	−31.1%	371,686	718,215	1,115,191
Idaho	R	−46.3%	112,057	319,953	449,439
Illinois	R	−1.6%	1,719,478	1,778,698	3,703,370
Indiana	R	−14.6%	697,775	952,116	1,744,221
Kansas	R	−43.7%	220,971	587,175	837,692
Kentucky	R	−11.5%	600,052	755,706	1,355,758
Louisiana	R	−18.9%	476,572	715,415	1,264,994
Maryland	D	+26.5%	1,140,615	655,666	1,831,744
Missouri	R	−13.6%	789,736	1,054,160	1,943,872
North Carolina	R	−11.8%	1,145,074	1,458,046	2,658,807
North Dakota	R	−54.0%	52,955	181,689	238,534
New Hampshire	R	−23.2%	167,545	273,218	454,710
Nevada	D	+5.7%	362,785	321,361	721,404
New York	D	+39.3%	3,047,880	1,239,605	4,595,515
Ohio	R	−17.4%	1,503,297	2,168,742	3,814,450
Oklahoma	R	−44.5%	265,814	718,482	1,017,151
Oregon	D	+18.0%	825,507	566,199	1,442,588
Pennsylvania	R	−2.0%	1,948,716	2,028,945	3,977,661
South Carolina	R	−34.4%	364,598	810,771	1,296,841
South Dakota	R	−100.0%	0	227,947	227,947
Utah	R	−28.8%	191,732	360,403	585,230
Vermont	D	+33.4%	151,281	72,699	235,065
Washington	D	+4.7%	1,314,930	1,196,164	2,511,094
Wisconsin	R	−4.8%	1,020,958	1,126,133	2,170,693
West Virginia	D	+10.1%	283,358	230,013	529,948