I agree with your statement that Jesus wouldn't have been happy with Bush. He has done many things against the teachings of Christ. Still, he was pro-life and he did something about it (partial birth abortion bill) and so he got my vote. These elections usually are a vote for the lesser of two evils (with each person voting according to their own conscience).
However, I think ministers would set their sites too low if they were to set their goals on emulating Martin Luther King. He was a great man and is to be honored for his message of peace and the work he did. But better yet, why not Martin Luther? I can think of few better people to emulate in we're to make a better tomorrow. Neither a Democrat or a Republican, and a very well educated man, as I hear. Wouldn't you agree?