August 20, 2015 Mother Jones
In Mother Jones, "...in the American Journal of Political Science, a team of researchers including Peter Hatemi of Penn State University and Rose McDermott of Brown University studied the relationship between our deep-seated tendencies to experience fear—tendencies that vary from person to person, partly for reasons that seem rooted in our genes—and our political beliefs."
"The Surprising Brain Differences Between Democrats and Republicans" - Mother Jones