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U.S. Senate Classes

Article I of the US Constitution mandates that the Senate be elected in cycles, such that one third of the Senators are elected every two years. A Senator's class refers to the cycle in which he/she was elected.

State	Name	Party	Seniority	Class	Next Election
AZ	Kyl	Republican	Jr	I	2012
CA	Feinstein	Democratic	Sr	I	2012
CT	Lieberman	Independent Democrat	Jr	I	2012
DE	Carper	Democratic	Jr	I	2012
FL	Nelson	Democratic	Sr	I	2012
HI	Akaka	Democratic	Jr	I	2012
IN	Lugar	Republican	Sr	I	2012
MA	Kennedy	Democratic	Sr	I	2012
MD	Cardin	Democratic	Jr	I	2012
ME	Snowe	Republican	Sr	I	2012
MI	Stabenow	Democratic	Jr	I	2012
MN	Klobuchar	Democratic/Farmer/Labor	Jr	I	2012
MO	McCaskill	Democratic	Jr	I	2012
MT	Tester	Democratic	Jr	I	2012
ND	Conrad	Democratic-NPL	Sr	I	2012
NE	Nelson	Democratic	Jr	I	2012
NJ	Menendez	Democratic	Jr	I	2012
NM	Bingaman	Democratic	Jr	I	2012
NV	Ensign	Republican	Jr	I	2012
NY	Clinton	Democratic	Jr	I	2012
OH	Brown	Democratic	Jr	I	2012
PA	Casey	Democratic	Jr	I	2012
RI	Whitehouse	Democratic	Jr	I	2012
TN	Corker	Republican	Jr	I	2012
TX	Hutchison	Republican	Sr	I	2012
UT	Hatch	Republican	Sr	I	2012
VA	Webb	Democratic	Jr	I	2012
VT	Sanders	Independent	Jr	I	2012
WA	Cantwell	Democratic	Jr	I	2012
WI	Kohl	Democratic	Sr	I	2012
WV	Byrd	Democratic	Sr	I	2012
AK	Murkowski	Republican	Jr	II	2010
AL	Shelby	Republican	Sr	II	2010
AR	Lincoln	Democratic	Sr	II	2010
AZ	McCain	Republican	Sr	II	2010
CA	Boxer	Democratic	Jr	II	2010
CO	Salazar	Democratic	Jr	II	2010
CT	Dodd	Democratic	Sr	II	2010
FL	Martinez	Republican	Jr	II	2010
GA	Isakson	Republican	Jr	II	2010
HI	Inouye	Democratic	Sr	II	2010
IA	Grassley	Republican	Sr	II	2010
ID	Crapo	Republican	Jr	II	2010
IN	Bayh	Democratic	Jr	II	2010
KS	Brownback	Republican	Sr	II	2010
KY	Bunning	Republican	Jr	II	2010
LA	Vitter	Republican	Jr	II	2010
MD	Mikulski	Democratic	Sr	II	2010
MO	Bond	Republican	Sr	II	2010
NC	Burr	Republican	Jr	II	2010
ND	Dorgan	Democratic-NPL	Jr	II	2010
NH	Gregg	Republican	Sr	II	2010
NV	Reid	Democratic	Sr	II	2010
NY	Schumer	Democratic	Sr	II	2010
OH	Voinovich	Republican	Sr	II	2010
OK	Coburn	Republican	Jr	II	2010
OR	Wyden	Democratic	Sr	II	2010
PA	Specter	Republican	Sr	II	2010
SC	DeMint	Republican	Jr	II	2010
SD	Thune	Republican	Jr	II	2010
UT	Bennett	Republican	Jr	II	2010
VT	Leahy	Democratic	Sr	II	2010
WA	Murray	Democratic	Sr	II	2010
WI	Feingold	Democratic	Jr	II	2010
AK	Stevens	Republican	Sr	III	2008
AL	Sessions	Republican	Jr	III	2008
AR	Pryor	Democratic	Jr	III	2008
CO	Allard	Republican	Sr	III	2008
DE	Biden	Democratic	Sr	III	2008
IA	Harkin	Democratic	Jr	III	2008
ID	Craig	Republican	Sr	III	2008
IL	Durbin	Democratic	Sr	III	2008
KS	Roberts	Republican	Jr	III	2008
KY	McConnell	Republican	Sr	III	2008
LA	Landrieu	Democratic	Sr	III	2008
MA	Kerry	Democratic	Jr	III	2008
ME	Collins	Republican	Jr	III	2008
MI	Levin	Democratic	Sr	III	2008
MN	Coleman	Republican	Sr	III	2008
MS	Cochran	Republican	Sr	III	2008
MS	Wicker	Republican	Jr	III	2008
MT	Baucus	Democratic	Sr	III	2008
NC	Dole	Republican	Sr	III	2008
NE	Hagel	Republican	Sr	III	2008
NH	Sununu	Republican	Jr	III	2008
NJ	Lautenberg	Democratic	Sr	III	2008
NM	Domenici	Republican	Sr	III	2008
OK	Inhofe	Republican	Sr	III	2008
OR	Smith	Republican	Jr	III	2008
RI	Reed	Democratic	Sr	III	2008
SC	Graham	Republican	Sr	III	2008
SD	Johnson	Democratic	Sr	III	2008
TN	Alexander	Republican	Sr	III	2008
TX	Cornyn	Republican	Jr	III	2008
VA	Warner	Republican	Sr	III	2008
WV	Rockefeller	Democratic	Jr	III	2008
WY	Barrasso	Republican	Jr	III	2008
WY	Enzi	Republican	Sr	III	2008
GA	Chambliss	Republican	Sr

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