FILE - In this Jan. 27, 1994 file photo, Sen. Barbara Boxer, D-Calif., left talks with Sen. Dianne Feinstein, D-Calif., talks prior to a hearing of the Senate Committee on Environment and Public Works, on Capitol Hill in Washington. The committee was holding hearings on the response of the Transportation Department and related agencies to the California earthquake. Boxer, one of the chamber's most tenacious liberals, announced Thursday she will not seek re-election in 2016 to a fifth term. A staunch supporter of abortion rights, gun control and environmental protections, Boxer has said she is most proud of the vote that she cast against the war in Iraq. (AP Photo/John Duricka, File)