2010 study in American Journal of Political Science on the persistent political gender gap in American politics.
2011 study by researchers from Bucknell and UNC Chapel Hill on the varied political views of those who self-identify as "conservative."
2006 Princeton University study on the relationship between growing income inequality and increasing political divisions in the United States.
2009 study by the Pew Center of the States on expenses incurred at the state and county levels in Oregon during the 2008 election.
2010 paper in American Journal of Political Science examining the possible link between education levels and voter turnout.
2011 study from University of Pennsylvania and Stanford University on the potential consequences of early voting methods.