Well he started out sounding like he had a spine..

but he did reply, maybe you should try to keep up conversation with him, show him more of the facts involved that he might be missing, and the facts that are missing on the bill. Theres always the initial fall out if the bill passes as it is, of owners and less responsible breeders releasing their now banned pets because they have no other real option.
I'm sure you know more about the implications than I do and what to tell him. I think persistence is key in alot of these cases.

Are their other members in Portland willing to send letters as well?

Can members from other states send letters? Id be willing to write one up as well.