What do I include in a letter to my state senator about a bill she co-sponsored that I deeply object to?

(The stage of the bill is that it’s going to be debated in a committee; its status on the govt website says it was “Referred to EDUCATION” ten days ago)

I think you pretty much hit the nail on the head in what to say. If you don’t want to do the research one by one you can say something like “I hope you will consider not supporting this bill because X” in general terms.

You can likely check the voting records on your state senate’s website since those are a matter of public record.

Good point about voting records, but this is a weeeeeeird one-off bill on an obscure topic, so I can’t really guess how previous voting would predict their vote here. Could I call their offices, ask if they have a position, and go from there?

(Is it more valuable to send an email, send a letter, or call an office?)

I know this is general, but can you elude on the topic of the bill, that is… if you want to.

Be as specific as you can and as polite as possible; do not tell them how ignorant or ill-informed they are just express your opinion and stress why you think it is important to all.

I have used email before (be prepared for a condescening, blanket response, written by an aide, explaining why you are out of touch) and most if not all have e-mail accounts now.

In fact, if you look at your senators’ website there may even be a way to express your opinion on the website.

Yes, you should definitely write to the other senators to express your opinion to them as well.

You are exactly right about what you want to say in your letter, and the action you should ask for is the one you want. Please withdraw the bill?

Include the bill number, the senator and his staff know most of the legislation by the bill number not the name. If you include the bill number you will avoid them trashing it.

Calling is more effective if you can get the senator or one of her senior staff members, but you will waste a lot of time on hold or with interns. Follow up with a legible written letter, a hand written letter carries more weight than an email or typed letter.