http://www.motherjones.com/politics/2014/07/biology-ideology-john-hibbing-negativity-bias
generic difference!!!
research article - pdf
http://journals.cambridge.org/download.php?file=%2FBBS%2FBBS37_03%2FS0140525X13001192a.pdf&code=27e7091bff42555a79829c68c457666d
