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2016 Senate races (to know who needs to be primaried)

Alabama Richard Shelby (R) Running
Alaska Lisa Murkowski (R)(write-in) Running
Arizona John McCain (R?) Not yet announced (NYA)
Arkansas John Boozman (R) Running
California Barbara Boxer (D) NYA
Colorado Michael Bennet (D) NYA
Connecticut Richard Blumenthal (D) NYA
Florida Marco Rubio (R) NYA
Georgia Johnny Isakson (R) Running
Hawaii Brian Schatz (D) NYA
Idaho Mike Crapo (R) Running
Illinois Mark Kirk (R) Running
Indiana Dan Coats (R) Running
Iowa Chuck Grassley (R) Running
Kansas Jerry Moran (R) Running
Kentucky Rand Paul (R) Running
Louisiana David Vitter (R) Leaving Office
Maryland Barbara Mikulski (D) Running
Missouri Roy Blunt (R) Running
Nevada Harry Reid (D) Running
New Hampshire Kelly Ayotte (R) Running
New York Chuck Schumer (D) NYA
North Carolina Richard Burr (R) Running
North Dakota John Hoeven (R) NYA
Ohio Rob Portman (R) Running
Oklahoma James Lankford (R) NYA
Oregon Ron Wyden (D) NYA
Pennsylvania Pat Toomey (R) NYA
South Carolina Tim Scott (R) NYA
South Dakota John Thune (R) NYA
Utah Mike Lee (R) NYA
Vermont Patrick Leahy (D) Running
Washington Patty Murray (D) Running
Wisconsin Ron Johnson (R) Running

Thirty-four seats are up for election in 2016:

Four Democrats are seeking re-election.
Six Democrats may seek re-election.
Fifteen Republicans are seeking re-election.
Nine Republicans may seek re-election.