Bob Altemeyer, Associate Professor, Department of Psychology, University of Manitoba,Winnipeg, Canada
has written a book "The Authoritarians" based on many years of research into political trends in the United States.
He says, "The greatest threat to American democracy today arises from a militant authoritarianism that has become a cancer upon the nation." It's free and has become a "must read" by many members of Congress.
Get it here