Dianne Feinstein, the longest-serving woman senator in history, has announced that she will not be running for re-election at the end of her current term. Throughout her career, she broke the glass ceiling time and time again, becoming the first woman mayor of San Francisco in 1978 and the first-ever female member of the Judiciary Committee in 1992. Her legacy of breaking barriers and paving the way for future generations of women in politics will live on.