You may or may not support your leader. None the less, you should pray for them and seek to find ways to help them understand right from wrong. Seek to find ways to indicate to them when they understand (be positive) as well as when they are wrong. Seek to know waht the decisions are that are being made and support ones you can, and for ones you do not: 1. Express your concern, 2. Offer some other choice.
If you write to a representative keep in mind to address only one issue per letter or e-mail. Many times reponses are piled as positive and negative and are not otherwise read. If you responded to more than one issue, then some of your expressions are going to be ineffective.