A look back at U.S. Sen. Barbara Boxer’s elections

U.S. Sen. Barbara Boxer announced last week that she would retire at the end of her fourth term, 24 years after the California Democrat moved from the House to the Senate.

It wasn’t easy to get there, and Boxer faced some tough campaigns for re-election. Along the way, she defeated three men and one woman, by percentage-point margins ranging from 4.9 (1992) to 20 (2004), while carrying from 19 counties (1992) to 27 (2004).

Click on an election below and hover over a county to get the vote breakdown. Or click here.

This story was originally published January 12, 2015 at 2:00 AM.