The 2012 Senate map

33 Senate contests were decided in 2012: Democrats won 23, Republicans 8, independents and others 2. 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

23

Republican wins

8

Other wins

2

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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
Arizona	R	−3.0%	1,036,542	1,104,457	2,243,108
California	D	+25.0%	7,864,624	4,713,887	12,578,511
Connecticut	D	+12.5%	792,983	604,569	1,504,895
Delaware	D	+37.5%	265,415	115,700	399,606
Florida	D	+13.0%	4,523,451	3,458,267	8,189,905
Hawaii	D	+25.2%	269,489	160,994	430,483
Indiana	D	+5.8%	1,281,181	1,133,621	2,560,084
Massachusetts	D	+7.5%	1,696,346	1,458,048	3,156,553
Maryland	D	+29.7%	1,474,028	693,291	2,630,505
Maine	O	−17.5%	92,900	215,399	700,599
Michigan	D	+20.8%	2,735,826	1,767,386	4,652,849
Minnesota	D	+34.7%	1,854,595	867,974	2,840,625
Missouri	D	+15.7%	1,494,125	1,066,159	2,725,752
Mississippi	R	−16.6%	503,467	709,626	1,241,568
Montana	D	+3.7%	236,123	218,051	486,066
North Dakota	D	+0.9%	161,337	158,401	319,738
Nebraska	R	−15.5%	332,979	455,593	788,572
New Jersey	D	+19.5%	1,987,680	1,329,534	3,376,649
New Mexico	D	+5.7%	395,717	351,260	775,176
Nevada	R	−1.2%	446,080	457,656	997,805
New York	D	+43.6%	4,420,043	1,514,647	6,660,665
Ohio	D	+6.0%	2,762,690	2,435,712	5,449,018
Pennsylvania	D	+9.1%	3,021,364	2,509,132	5,627,422
Rhode Island	D	+29.9%	271,034	146,222	417,256
Tennessee	R	−34.5%	705,882	1,506,443	2,320,189
Texas	R	−15.8%	3,194,927	4,440,137	7,864,822
Utah	R	−35.3%	301,873	657,608	1,006,900
Virginia	D	+5.9%	2,010,067	1,785,542	3,795,609
Vermont	O	−24.9%	0	72,898	292,510
Washington	D	+20.9%	1,855,493	1,213,924	3,069,417
Wisconsin	D	+5.5%	1,547,104	1,380,126	3,009,298
West Virginia	D	+24.1%	399,898	240,787	660,202
Wyoming	R	−54.1%	53,019	185,250	244,445