Hello, Heterogeneity June 3, 2012 … Given the scope of the demographic and ideological transformation of the United States over the last six decades, it’s interesting that the two-party system has not imploded. [cont.] Thomas B. Edsall, Columbia University (NYT) Share:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)Click to email a link to a friend (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)MoreClick to print (Opens in new window)