There are indeed no Constitutional constraints on the citizens motivations for wanting to amend the Constitution. It is, however politically oxymoronic to claim doing it is "conservative".
There is nothing oxymoronic about cliaming to be a conservative and wanting the Constitution amended to protect unborn human beings. Not a damn thing.
If you want to say that Huckabee has some moronic ideas or that he uses his religion too politcally that is one thing but what you stated is another. And you are wrong. The Constitution has provisions for the amendment process and the pro life leg of the party is part of the conservative coalition. That would include me though it isn't sufficient to describe my conservatism since I am a three legged conservative. :-}