How about this site?
http://www.cosmosmagazine.com/news/2202/study-calm-people-are-liberal-skittish-are-conservative
WASHINGTON DC: Calm people tend to be liberals, while those who react strongly to sudden noises and threatening images tend to be political conservatives, says a study in the U.S. journal Science today.
"Individuals with measurably lower physical sensitivities to sudden noises and threatening visual images were more likely to support foreign aid, liberal immigration policies, pacifism, and gun control," said the study conducted by U.S. researchers from Rice University in Texas, the University of Nebraska-Lincoln, the University of Illinois, and the Virginia Institute for Psychiatric and Behavioural Genetics.
Individuals displaying measurably higher physiological reactions to those same stimuli were more likely to favour defence spending, capital punishment, patriotism, and the Iraq war," the authors write.
Participants in the study were selected randomly by phone and screened to determine if they held strong political beliefs, regardless of which way they leaned. Forty-six people who were retained for the study were then asked to fill out a questionnaire asking them, among other things, about their political beliefs.