The Protestant theologian Stanley Hauerwas is well known for his view that Christians must be uncompromising in their dealings with the political order. He refers positively to Christian "fanatics" and spiritual "terrorists." There is certainly a place for this sort of prophetic stance in Christian tradition, but it is not one that has typically been embraced by Catholic Christians. By contrast, Catholic tradition has sought to work pragmatically with political leaders to secure the common good, while not compromising core beliefs.
This is why the ongoing conflict between the Obama administration and the U.S. Catholic bishops is so disheartening. The most recent dust-up is over the decision by the Department of Health and Human Services not to award a federal grant to the U.S. Conference of Catholic Bishops' Migration and Refugee Services office to continue its work with the victims of human trafficking. Apparently the decision of HHS was influenced by the fact that MRS does not refer trafficking victims for contraceptive or abortions services.