Photos: Through the years | Sen. Barbara Boxer

President Clinton shakes the hand of San Francisco Mayor Willie Brown before speaking at the Presidio of San Francisco with Sen. Barbara Boxer, second from right, and Sen. Dianne Feinstein June 9, 1996.  (Gina Ferazzi / Los Angeles Times)

Barbara Boxer acknowledges her supporters in San Francisco on Tuesday, Nov. 4, 1992, after claiming victory in her race against Republican challenger Bruce Herschensohn.   (Slava J. Veder / Associated Press)

Standing on what she jokingly refers to as “Boxer’s box,” Barbara Boxer gives a speech in San Bernardino in 1994.   (Greg Gibson / Associated Press)

California Sens. Barbara Boxer, second from left, and Dianne Feinstein, center, with Illinois Sen. Carol Moseley-Braun, right, and Washington state Sen. Patty Murray, wave at the Democratic National Convention Aug. 28, 1996.  (Gary Friedman / Los Angeles Times)

Sen. Barbara Boxer gets help putting on her labor apron from her husband Stewart Boxer during an annual Labor Day Breakfast and Festival, Sept. 7, 1998.   (Rick Meyer / Los Angeles Times)

Barbara Boxer with President Clinton at a fundraiser in 1998.  (Wilfredo Lee / Associated Press)

Sen. Barbara Boxer during a meeting she had with residents in Chatsworth to discuss the ongoing cleanup of the Rocketdyne facility, Aug 8, 2002.  (George Wilhelm / Los Angeles Times)

Sen. Barbara Boxer holds a press conference in Oxnard to promote the community policing programs of the Oxnard Police Department at Brekke Elementary School, Oct. 18, 2003.   (Bryan Chan / Los Angeles Times)

Sen, Barbara Boxer during a campaign rally that kicked off her reelection campaign in Los Angeles March 16, 2004.   (Ricardo DeAratanha / Los Angeles Times)

Sen. Barbara Boxer holds a news conference Jan. 24, 2006, in the council chambers at Burbank City Hall to announce that she was not supporting the nomination of Judge Samuel Alito to the U.S. Supreme Court.  (Gary Friedman / Los Angeles Times)

Sen. Barbara Boxer acknowledges the cheers of the crowd at the Moving America Forward Rally on the USC campus on Oct. 21, 2010.   (Genaro Molina / Los Angeles Times)

Sen. Barbara Boxer answers questions from reporters during a campaign stop at Patys Restaurant in Toluca Lake on the day before election day Nov 1, 2010.   (Rick Loomis / Los Angeles Times)

On her final day of campaigning, Barbara Boxer works up the crowd at a get-out-the-vote rally on the steps of the L.A. Public Library Nov. 1, 2010.   (Mark Boster / Los Angeles Times)

Sen. Barbara Boxer with supporters after speaking at the Democratic Party election night celebration at the Renaissance Hollywood Hotel, Nov. 2, 2010.   (Jay L. Clendenin / Los Angeles Times)

Sen. Barbara Boxer with Mayor Antonio Villaraigosa at the 6th Street Bridge in downtown Los Angeles to call on Congress to pass legislation that will fix deficient roads and bridges and fund new transportation infrastructure projects, on October 27, 2011.   (Al Seib / Los Angeles Times)

Sen. Barbara Boxer, center, during a campaign stop for Los Angeles mayoral candidate Wendy Greuel, right, with Rep. Janice Hahn during a roundtable of female leaders at The Feminist Majority in Beverly Hills on April 4, 2013.   (Gary Friedman / Los Angeles Times)

Sen. Barbara Boxer speaks at the unveiling of the Desert Renewable Energy Conservation Plan at the AES mountain view wind farm in the San Gorgonio Pass in Palm Springs Tuesday, Sept. 23, 2014.  (Allen J. Schaben / Los Angeles Times)

Sen. Barbara Boxer (D-Calif.) looks on during a hearing on sexual assaults in the military March 13, 2013, in Washington.   (Win McNamee / Getty Images)