** FILE ** In this Dec. 17, 2011, file photo, Sen. Olympia Snowe, Maine Republican, comments in the U.S. Capitol in Washington, after leaving the floor of the Senate. Snowe, who has served 33 years in Congress, released a statement Tuesday, Feb. 28, 2012 saying that she will not run for re-election. (AP Photo/J. Scott Applewhite, File)

Photo by: J. Scott Applewhite

** FILE ** In this Dec. 17, 2011, file photo, Sen. Olympia Snowe, Maine Republican, comments in the U.S. Capitol in Washington, after leaving the floor of the Senate. Snowe, who has served 33 years in Congress, released a statement Tuesday, Feb. 28, 2012 saying that she will not run for re-election. (AP Photo/J. Scott Applewhite, File)