Sorry, but the definition of a Christian is as found in the Bible. It is not a question of whether the person's politics are liberal. It is whether or not the hold to the historic Christian faith. When some of us say "liberal" Christian, we mean a person who rejects one or more of the cardinal tenets of the faith: the divinity of Christ, the Virgin Birth, etc.
I thought you were trying to say that liberals can't be Christians, and that only conservatives could be 'real' Christians.