I have just finished reading "Republican Gomorrah" and I recommend it without reservation.
There are roughly speaking two sections to the book, the first drawing the links between between the anti-democracy theocratic cause founded by R. J. Rushdoony, which was supported and augmented by such well known right-wingers as Jerry Fallwell, Tom McClintock, James Dobson, Chuck Carlson, Gary North, and a devils squadron of others. One name less known is the extremist sugar-daddy Howard Ahmanson Jr. From these men, a web of "institutes" and "foundations" funnels money into ultra-right political candidates.
The second section focuses on the particular obsession the far-right has with homosexuality, often exposed as caused by their repression of their own homosexuality. The recent cases are too familiar to need mentioning here.
I have a single quibble, and that is with the subtitle, "Inside the movement that shattered the Party." Sadly, the Republican Party is not shattered, it has been dominated by religious extremists. The Republicans of Lincoln, Roosevelt, and Eisenhower are long gone and buried. Nixon was too liberal for today's religious-right Party. Even the Republicans of Goldwater, or Reagan are in the past.
Blumenthal has burrowed deep into the belly of the new Republican Party- the new Theocratic Party.
Additional highly recommended reading:
Barbara Carroll Forrest, Paul R. Gross
2004 "Creationism's Trojan Horse: The Wedge of Intelligent Design
" Oxford University Press
2008 "American Fascists: The Christian Right and the War on America
" New York: Free Press.
2006 "American Theocracy: The Peril and Politics of Radical Religion, Oil, and Borrowed Money in the 21stCentury
" New York: Viking Press
2005 "The Republican War on Science
" New York: Basic Press
2008 "The Family: The Secret Fundamentalism at the Heart of American Power
" New York: Harper Collins