Who do you vote for if you're pro-life and pro-environment?

I am very confused as to who to vote for this year. I am a conservative Christian. I am pro-life, anti-death penalty, pro-environment and I am against gay marriage. I think we should tax the rich and do away with corporate welfare. I disagree with off-shore and Alaskan drilling. I believe that the Iraq war had nothing to do with WMD and everything to do with retaliation and revenge. I would very much like for the war(s) to be over but I also feel like we are stuck there. On many issues I agree with Obama. However, I feel that he is too liberal on issues that go against my conservative moral beliefs. I really don't know who I should vote for and am getting very discouraged. I would appreciate sound, respectful discussions from all sides.