Ryan Lizza’s in-depth examination in The New Yorker.  He talks about evangelical guru Francis Schaeffer, whose book and later video series “How should we then live” chronicled the decline of Christianity from the Renaissance on, and was wildly popular among a certain subset of Evangelicals in the late 70s (I remember trying to read the book at the insistence of a classmate in 79 or 80 and being finding it offensive and occasionally humorous). He also discusses the faculty of the law school at Oral Roberts University. Lizza begins, however, with this statement:

Bachmann belongs to a generation of Christian conservatives whose views have been shaped by institutions, tracts, and leaders not commonly known to secular Americans, or even to most Christians.