We are a People once not a people, but now the People of God
As Christians we cannot be separated by politics, culture, locality or language. We are One Body, and our first and foremost loyalty should be to God and then to each other
We cannot, seriously, be consumed in a system that pits Christian against Christian. Yes, we will sometimes (maybe often) disagree in areas where political, cultural or ideological views are divergent, and possibly all three to the extent that much of our political and ideological view is coloured by our cultural heritage. But we must not let that hinder the work of the Gospel nor let it hinder our love for one another.
Dietrich Bonhoeffer, the famous theologian, died in the concentration camps. His loyalty was not firstly to his government nor his nation. His loyalty was to God, and he died for an attempt to bring WWII to a speedy end. In that way he showed more love to the many British and American Christians that were suffering in the battle against Hitler. Was he a traitor? No, because his primary nationality, his real citizenship, was heavenly, not German.
In our disagreements over whether the political left or the political right; the capitalist or the socialist; the libertarian or the anarchist are correct or more correct, we must be careful that we do not lose sight of the undeniable fact that we are of the same eternal Kingdom and we belong to God and to each other, and not to the systems of this present world.
Taking self-profession as sufficient and not a cause for argument over doctrinal and practicable ideologies, President Obama is the brother of former President Bush, and they (and we) are a nation of God, not of the world.