Senate stalwart Dianne Feinstein died Thursday at the age of 90. Today, we talk about her legacy — and the existential crisis for Democrats that comes with her vacant Senate seat. Read more:Sen. Dianne Feinstein, centrist stalwart of the U.S. Senate, died Thursday. At age 90, she was the chamber’s oldest sitting member and its longest-serving woman.Although the question of her fitness to serve received increasing scrutiny after she was hospitalized in February, Feinstein worked in politics for more than 50 years. She started in local politics in her home city of San Francisco and eventually became the city’s mayor. Then, in 1992, Feinstein became the first woman elected to the Senate from the state of California.Today, senior congressional correspondent Paul Kane discusses the late senator’s life, legacy and the big question on the minds of many on Capitol Hill: What will happen to her vacant Senate seat?A previous version of this episode incorrectly stated, upon second reference, the year in which San Francisco's mayor and city supervisor Harvey Milk were killed. It was November of 1978, not 1979. The audio has been updated to remove the error.