This morning, I finished With God On Our Side by William Martin.

Subtitled "The Rise of the Religious Right in America", this book catalogs the shift in the 20th century from a religious population that worked hard to keep itself separate from politics to one that saw politics as an integral part in protecting, and extending, it's values in the public sphere.

The cover is a little misleading - it shows George W Bush as part of a progression of religious leaders, but the book was published in 1996, well before the 2nd Bush had moved into national prominence.

Overall, it's a well written look at the rise of this movement, written in a fairly non-biased way. If you are interested in how the religious right is influencing American politics, at both the grass roots and upper levels, this is a must read.