State Sen. Gloria Romero, a Los Angeles Democrat, recently wrote the letter to Los Angeles County District Attorney Steve Cooley saying the 76-year-old filmmaker should face his past and that "no one is above the law."
Romero says the Polanski case heightens awareness about domestic violence and its correlation to sexual assault.
Polanski has been in Swiss custody since last month on a fugitive warrant for fleeing Los Angeles before being sentenced for having unlawful sex with a 13-year-old girl in 1977.
An extradition request was filed last week. Zurich authorities will hold a hearing on an unspecified date to rule on the request.