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

updated May 16, 2012

Current balance is 51 Democrats, 47 Republicans and 2 Independents.
Democrats are defending 21 seats, compared to just ten for the Republicans; additionally the two Independents tend to align with the Democrats.  There are ten open seats due to retirements plus the Indiana seat opened by Sen. Lugar's defeat.  Democrats are defending six of those and the Lieberman (I) seat; Republicans are defending three open seats plus the Lugar seat.
See also: DSCC (organization) |  NRSC (organization).

Primary
 DEMOCRATIC INCUMBENTS
 		REPUBLICAN
 		THIRD PARTY / INDEPENDENT
CA
 		June 5
 Dianne Feinstein

DE
 		Sept. 11
 Tom Carper

FL
 		Aug. 14
 Bill Nelson

HI
 		Aug. 11
 [Daniel Akaka announced retirement on March 2, 2011]

MD
 		April 3
 Ben Cardin
 		Dan Bongino
MI
 		Aug. 7
 Debbie Stabenow

MN
 		Aug. 14
 Amy Klobuchar

MO
 		Aug. 7
 Claire McCaskill

MT
 		June 5
 Jon Tester

NE
 		May 15
 Bob Kerry
[Ben Nelson announced retirement on Dec. 27, 2011]
 		Deb Fischer
 Russell Anderson
NJ
 		June 5
 Bob Menendez 


NM
 		June 5
 [Jeff Bingaman announced retirement on Feb. 18, 2011]

NY
 		June 26
 Kirsten Gillibrand

ND
 		June 12
 [Kent Conrad announced retirement on Jan. 18, 2011]

OH
 		March 6
 Sherrod Brown
 		Josh Mandel
PA
 		April 24
 Bob Casey, Jr.
 		Tom Smith
RI
 		Sept. 11
 Sheldon Whitehouse

VA
 		June 12
 [Jim Webb announced retirement on Feb. 9, 2011]

WA
 		Aug. 7
 		Maria Cantwell

WV
 		May 8
 		Joe Manchin
 John Raese
WI
 		Aug. 14
 		[Herb Kohl announced retirement on May 13, 2011]





INDEPENDENT INCUMBENTS
CT
 Aug. 14

[Joe Lieberman announced retirement on Jan. 19, 2011]
VT
 Aug. 28

Bernie Sanders


Primary
REPUBLICAN INCUMBENTS
 		THIRD PARTY / INDEPENDENT
AZ
 		Aug. 28
[John Kyl announced retirement on Feb. 10, 2011]
IN
 		May 8
 Joe Donnelly
 		Richard Mourdock
[Richard Lugar defeated in May 8, 2012 primary]
 		Andrew Horning (Lib.)
ME
 		June 12
[Olympia Snowe announced retirement on Feb. 28, 2012]
MA
 		Sept. 6
Scott Brown
MS
 		March 13
 Albert N. Gore, Jr.
 		Roger Wicker
 		Thomas Cramer (Const.)
Shawn O'Hara (Ref.)
NV
 		June 12
Dean Heller
TN
 		Aug. 2
Bob Corker
TX
 		May 29
[Kay Bailey Hutchison announced retirement on Jan. 13, 2011]
UT
 		June 26
Orrin Hatch
WY
 		Aug. 21
John Barrasso


Retirements
.
  
D.Akaka
 J.Bingaman
 K.Conrad J.Lieberman
 J.Webb
 H.Kohl
 B.Nelson

K.Hutchison
 J.Kyl
 O.Snowe






















D.Lugar


note:
[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