MAJORITY

• 1,000Patty Murray

  [D] WA, United States

  Ended 01/03/2013
• 297Jeffery "Jeff" Merkley

  [D] OR, United States
• 1,423Thomas "Tom" Harkin

  [D] IA, United States
• 186Kay R Hagan

  [D] NC, United States
• 215Richard Blumenthal

  [D] CT, United States

  Began 03/24/2011
• 792Barbara A. Mikulski

  [D] MD, United States
• 565Sherrod Brown

  [D] OH, United States
• 1,021Jeff Bingaman

  [D] NM, United States

  Began 03/24/2011
• 613Sheldon Whitehouse

  [D] RI, United States

  Began 03/24/2011
• 162Michael Bennet

  [D] CO, United States

  Began 03/24/2011

MINORITY

• 427John "Johnny" Isakson

  [R] GA, United States

  Ended 01/03/2013
• 723Lamar Alexander

  [R] TN, United States

  Began 03/24/2011
• 652Michael "Mike" B. Enzi

  [R] WY, United States
• 83Mark Steven Kirk

  [R] IL, United States

  Began 03/24/2011
• 209Richard Burr

  [R] NC, United States
• 346Lisa Murkowski

  [R] AK, United States
• 241Al Franken

  [D] MN, United States

  Ended 01/03/2013
• 1,978Orrin Hatch

  [R] UT, United States

  Ended 01/03/2013
• 2,274John S. McCain III

  [R] AZ, United States