U.S. Senate Races
U.S. Senate  |  U.S. House (plus Reapportionment and Redistricting)  |  Governors

 revised April 14, 2013                   

Balance before was 51 Democrats, 47 Republicans and 2 Independents.
33 seats at stake: 21 held by Democrats, 10 by Republicans and 2 by Independents.
11 open seats: 6 held by Democrats, 4 by Republicans and 1
by Independent.
10 retirements, 1 defeated in primary.
Of 23 sitting Senators seeking re-election in 2012, 21 succeeded.
12 new Senators elected.
Democrats won 23 races, Republicans won 8 races, and Independents won 2 races.
Balance after was 53 Democrats, 45 Republicans and 2 Independents.

Overview [graphic and results]
Republicans had high hopes of winning a majority in the Senate, but Democrats held all their open seats except one (Nebraska),
defended vulnerable incumbents (ex. Missouri, Montana...), and actually managed to pick up seats in Indiana and Massachusetts; additionally the Maine seat was won by an Independent.  Of the 65 major party nominees, 18 were women (27.7 percent), including 12 Democrats and six Republicans.  The new Senators are Democrats Tammy Baldwin (WI), Joe Donnelly (CT), Martin Heinrich (NM), Heidi Heitkamp (ND), Mazie Hirono (HI), Tim Kaine (VA), Chris Murphy (CT) and Elizabeth Warren (MA), Republicans Ted Cruz (TX), Deb Fischer (NE), Jeff Flake (AZ) and Independent Angus King (ME).*
See also: DSCC organization  |  NRSC organization  |  Senate Races 2010 

Winners in bold; not every third party and independent candidate is shown.


Primary
DEMOCRATIC INCUMBENT
REPUBLICAN
THIRD PARTY / INDEPENDENT
CA
June 5
Dianne Feinstein
Elizabeth Emken
none
DE
Sept. 11
Tom Carper
Kevin Wade
Andrew Groff (Grn.)
Alex Pires (Ind.)
FL
Aug. 14
Bill Nelson
Connie Mack
several independents.
HI
Aug. 11
Mazie Hirono
[Daniel Akaka announced retirement on March 2, 2011]

Linda Lingle

MD
April 3
Ben Cardin
Dan Bongino
Rob Sobhani (Ind.)
Imad "Dean" Ahmad (Lib.)
MI
Aug. 7
Debbie Stabenow
Pete Hoekstra
Harley Mikkelson (Grn.)
Scotty Boman (Lib.)
MN
Aug. 14
Amy Klobuchar
Kurt Bills
Stephen Williams (Indep.)
MO
Aug. 7
Claire McCaskill
Todd Akin
Jonathan Dine (Lib.)
MT
June 5
Jon Tester
Denny Rehberg

NE
May 15
Bob Kerry
[Ben Nelson announced retirement on Dec. 27, 2011]

Deb Fischer
Russell Anderson
NJ
June 5
Bob Menendez 
Joe Kyrillos
Ken Wolski (Grn.)
Kenneth Del Vecchio (Lib.) tw
NM
June 5
Martin Heinrich
[Jeff Bingaman announced retirement on Feb. 18, 2011]
Heather Wilson

NY
June 26
Kirsten Gillibrand Wendy Long
Colia Clark (Grn.)
ND
June 12
Heidi Heitkamp
[Kent Conrad announced retirement on Jan. 18, 2011]

Rick Berg

OH
March 6
Sherrod Brown
Josh Mandel

PA
April 24
Bob Casey, Jr.
Tom Smith

RI
Sept. 11
Sheldon Whitehouse
Barry Hinkley
several independents
VA
June 12
Tim Kaine
[Jim Webb announced retirement on Feb. 9, 2011]
George Allen

WA
Aug. 7
Maria Cantwell
Michael Baumgartner

WV
May 8
Joe Manchin
John Raese

WI
Aug. 14
Tammy Baldwin
[Herb Kohl announced retirement on May 13, 2011]

Tommy Thompson





INDEPENDENT INCUMBENTS
CT
Aug. 14
Chris Murphy
Linda McMahon
[Joe Lieberman announced retirement on Jan. 19, 2011]
VT
Aug. 28

John MacGovern
Bernie Sanders


Primary

REPUBLICAN INCUMBENT
THIRD PARTY / INDEPENDENT
AZ
Aug. 28
Richard Carmona
Jeff Flake
[John Kyl announced retirement on Feb. 10, 2011]

Marc J. Victor (Lib.)
IN
May 8
Joe Donnelly
Richard Mourdock
[Richard Lugar defeated in May 8, 2012 primary]

Andrew Horning (Lib.)
ME
June 12
Cynthia Ann Dill
Charles E. Summers
[Olympia Snowe announced retirement on Feb. 28, 2012]

Angus King (Indep.)
Andrew Ian Dodge (Lib.)
MA
Sept. 6
Elizabeth Warren
Scott Brown
Bill Cimbrelo (Ind).
MS
March 13
Albert N. Gore, Jr.
Roger Wicker
Thomas Cramer (Const.)
Shawn O'Hara (Ref.)
NV
June 12
Shelley Berkley
Dean Heller
David Lory VanDerBeek (IAP)
TN
Aug. 2
Mark Clayton *TNDP disavowed
Bob Corker
Martin Pleasant (Grn.)
TX
May 29
July 31 runoffs
Paul Sadler
Ted Cruz
[Kay Bailey Hutchison announced
retirement on Jan. 13, 2011]
David Collins (Grn.)
John Jay Myers (Lib.)
UT
June 26
Scott Howell
Orrin Hatch
Shaun McCausland (Const.)
Daniel Geery (Just.)
Bill Barron (Ind.)
WY
Aug. 21
Tim Chesnut
John Barrasso
Joel Otto (WYCountry)

Retirements
.
 
D.Akaka
appt'd '90; elected '90, '94
J.Bingaman
elected '82
K.Conrad
elected '86; spec. '92, '94
J.Lieberman
elected '88
J.Webb
elected '06
H.Kohl
elected '88
B.Nelson
elected '00


K.Hutchison
elected '93, '94
J.Kyl
elected '94
O.Snowe
elected '94










Defeated in primary:











D.Lugar
elected '76
[John Ensign (R) announced he would retire on March 7, 2011.  Then, on April 21, he announced his resignation, effective May 3.  Gov. Sandoval appointed Rep. Dean Heller (R) to fill the remainder of the term, and Heller was sworn in on May 9]
J.Ensign


Most Expensive 2012 U.S. Senate Races (General Election)
(millions of dollars)

Candidate Committees
Outside Spending
Total
Massachusetts $77.3
$7.5
$84.7
Virginia
$32.3
$48.0
$80.3
Ohio
$43.5
$36.3
$79.8
Connecticut
$59.9
$8.3
$68.3
Wisconsin
$24.8
$39.3
$64.1
Source: Center for Responsive Politics.

Campaign Finance

For the 2011-12 cycle, the Federal Election Commission (+) reported that Senate candidate committees raised $742.2 million (Rep. $416.1 million, Dem. $307.9 million and other $18.2 million) and spent $747.9 million (Rep. $417.9 million, Dem. $315.6 million and other $14.5 million). 
The party committees raised and spent additional millions.  The Center for Responsive Politics reported that for the 2012 cycle the NRSC raised $117.0 million, spent $113.8 million and finished with cash on hand of $3.4 million and the DSCC raised $145.9 million, spent $144.9 million and finished with $1.8 million (these numbers include their independent expenditures).  Other outside groups spent many tens of millions more (+).  A look at the most expensive general election races shows the significant role outside spending played in some contests.


Note: There were also developments in three seats in the period between Election Day, November 6, and the start of the 113th Congress. 

SC - On Dec. 6, Sen. Jim DeMint (R-SC) surprised just about everyone when he announced he would resign effective Jan. 1, 2013 to become president of the Heritage Foundation; Gov. Nikki Haley (R) announced on Dec. 17 that she would appoint Rep. Tim Scott (R) to the position. 

HI - On Dec. 17, Sen. Daniel Inouye (D-HI), elected to a ninth term in 2010, died; Gov. Neil Abercrombie (D) announced on Dec. 26 his selection of Lt. Gov. Brian Schatz (D) for the position.

MA - On Dec. 21, President Obama announced he would nominate Sen. John Kerry (D-MA) as Secretary of State; Kerry was confirmed on Jan. 29, 2013 and on Jan. 30 Gov. Deval Patrick (D) appointed William "Mo" Cowan to fill in until a special election is held (on Jan. 28, MA Sec. of State William Galvin announced the dates as April 30 for the primary and June 25 for the general election).