When I wrote to Feinstein in the past, I received a form letter telling me that her mind was already made up and that she knew was was in my best interest. She didn't even have the courtesy to lie and say that she would consider my opinion. I'm in her district, and I lost a lot of hope at that moment.
In fairness, there are 40 million people in her 'district', so your chances of an individualized reply and/or influencing her opinion on any controversial matter would have to be quite low.
