2010 study in American Journal of Political Science on the persistent political gender gap in American politics.
2008 study published in the Journal of Economic Perspectives on the factors that have hurt the U.S. pension-insurance corporation.
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 University of Pennsylvania Law School research paper looking at the trade-offs between the two options.