The Anabaptist Option:
Neo-Calvinist Cornelius Van Til was a lifelong Republican voter, but couldn't crack the application of Reformed theology to politics. How does the Christian worldview manifest in the political realm with regard to particular parties and politicians?
Van Til's student, Francis Schaeffer, motivated by his postmillennialism in the Cold War context, promoted Christianity as antithetical to communism. Fundamentalist friends like Jerry Falwell found political motivation in the moralist message of Schaeffer's A Christian Manifesto.
The aforementioned mindset put the Moral Majority (1979) into motion right around the time of the Conservative Resurgence in the Southern Baptist Convention (1979) and the presidential run of Ronald Reagan (1981). Similar rhetoric and results followed in the years to come.
Politicians, knowing they had to secure the votes of the Moral Majority, or 'Values Voters,' or 'evangelicals' as a voting bloc, pandered to them by citing their 'Christian faith' and 'pro-life' positions which ran counter to Roe v. Wade (1973), another Schaefferian target.
Those left unpersuaded by the aforementioned project were no longer merely political opponents, but morally inferior people, most likely owing to a lack of true Christian faith and practice. Clearly, the moral failings of Bill Clinton weren't consistent with his Christian faith.