Absolutely. That is exactly what you have to do. My point is that if you have:

utility = sum over policy areas of ability-to-change(policy) times (your-worth(their-preferred(policy)) - your-worth(default(policy)))

Most summaries of ability-to-change(policy) as a single number will have examples of your-worth(their-preferred(policy)) such that increasing their overall ability to implement their platform does worse, even in the cases where they broadly agree with you.