30. The qualitative methods field has blossomed in recent years to the extent that there is no such thing anymore as a “qualitative approach.” This is particularly the case in comparative politics. See, e.g., Mahoney, James, “Qualitative Methodology and Comparative Politics,” Comparative Political Studies 40, 2 (2007): 122–44Google Scholar; Bennett, Andrew and Elman, Colin, “Qualitative Research: Recent Developments in Case Study Methods,” Annual Review of Political Science 9 (2006): 455–76Google Scholar; Brady, Henry E. and Collier, David, eds., Rethinking Social Inquiry: Diverse Tools, Shared Standards (Lanham, MD: Rowman and Littlefield, 2004)Google Scholar; Mahoney, James and Rueschemeyer, Dietrich, eds., Comparative Historical Analysis in the Social Sciences (New York: Cambridge University Press, 2003)Google Scholar. Within qualitative methods, counterfactual analysis has itself burgeoned, though it has found more of a home in studies of international politics than in American politics. See Fearon, James, “Counterfactuals and Hypothesis Testing in Political Science,” World Politics 43, 1 (1991): 169–95Google Scholar; Lebow, Richard Ned, “What's So Different about a Counterfactual?” World Politics 52, 4 (2000): 550–85Google Scholar; Tetlock, Philip and Belkin, Aaron, Counterfactual Thought Experiments in World Politics: Logical, Methodological, and Psychological Perspectives (Princeton, NJ: Princeton University Press, 1996)Google Scholar. In American politics, see Chwieroth, Jeffrey M., “Counterfactuals and the Study of the American Presidency,” Presidential Studies Quarterly 32, 2 (2004): 293–327Google Scholar; Hacker, Jacob, “Learning from Defeat: Political Analysis and the Failure of Health Care Reform in the United States” British Journal of Political Science 31, 1 (January 2001): 61–94Google Scholar.