Think people don't vote name recognition? Think politicians don't know that? They're like movie star women who've been married multiple times, but keep their famous name.
Dianne Fienstine hasn't been Dianne Feinstein in 43 years. Her husband, Bertram Feinstein died in 1978.
In 1980, Feinstein married Richard Blum, so Dianne Feinstein is really (or was) Dianne Blum.
If she had changed her name in 1980 when she married, she'd have lost her name recognition. And possibly her political career.