That lawmaker may feel that all the people of substance leaving Kalifornia is a threat to his paycheck.

Six of my friends have bought homes in Merida, Mexico (Yucatan). One is an APN and she recites that they have six wonderful hospitals, ultra sanitary and very good doctors. She had her knee replaced for $2500 this included hospital stay, etc. She praised the nursing care. She said her dog groomer comes to her home and charges $6. A lot of Irish people have become expats also. English is spoken freely and they are welcomed there. Her husband has formed a construction company! I'm going for a visit in October. I believe Merida has over a million people and I saw her pictures showing very clean streets, etc.

Abaco, It is disappoint that you have to leave your current state (guessing California) It is also sad about liquidating your property. Hope that goes well for you.
I live in an eastcosat state and given the situation here I face the same situation. Different reasosn but same situation. This is especially hard because my children and grandchildren live in this area. It comes down to with the taxes and other growing infringements on personal liberty here I find it impossible to remain.
You did not mention any particular party but the controlling party here is establishing ever tightenin restrins on parental rights and every loosening restriction on drugs and such .
You have ny deepest sympathies.

I would stay focused on very specific things. "My colleagues and I really care about X and would like to see you vote against Assembly Resolution XYZ unless there is some change ensuring ABC."

Your argument about leaving is valid but seems like a remote academic issue because they're not having an immediate problem with flight of talent and capital, so it just sounds like you're going to take your ball and go home in a huff. A specific vote, however, is an immediate, actionable thing. It should positive: "We know it's hard to balance all constituents' needs, but those of us in [such-and-such industry or interest group], really need to see ABC happen." After that I would mention a past fundraiser or a future event where you might see him, and then leave quickly, resisting any urge to share thoughts that might detract from the message "Vote no on XYZ.". Follow up with a right-to-the-point letter after the vote saying you're pleased or disappointed that sides for or against your on Resolution XYZ.

I feel like this approach has worked for me, BUT I've only done it a few times and I never know if it's post hoc ergo propter hoc.