There's a great article in The New Yorker about how the Michele Bachmann we know came to be. Here's a link:

Michele grew up in a Democratic family. Her father was a Civil War history buff who apparently didn't have any kind words for the South. His opinion of the South sharply contrasts to how Michele Bachmann views slavery (posted below).

She and her husband attended Jimmy Carter's inauguration. But suddenly they turned sharp right after being introduced to the movies of Francis Shaeffer, whose series "How Should We Then Live?" intertwined religion and politics. Shaeffer condemns the Italian Renaissance, the Enlightenment, Darwin, secular humanism, and postmodernism.

Also mentioned in the article is a 1997 biography of Robert E. Lee by J. Steven Wilkins. The book discusses that abolition of slaves could not arrive until blacks were fit to be freed through the indoctrination of Christianity. There's also this passage:

Slavery, as it operated in the pervasively Christian society which was the old South, was not an adversarial relationship founded upon racial animosity. In fact, it bred on the whole, not contempt, but, over time, mutual respect. This produced a mutual esteem of the sort that always results when men give themselves to a common cause. The credit for this startling reality must go to the Christian faith. . . . The unity and companionship that existed between the races in the South prior to the war was the fruit of a common faith.

The 1997 Robert E. Lee biography was listed as one of Michele's Must Reads (at #3).