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It has often been stated that in the United States the left tends to be less united than the right on issues related to identity politics such as race, gender, and religion. This article presents evidence that this asymmetry in partisan alignment over identity politics is changing over time. Looking at various measures of public opinion shows that the left's agreement on issues related to identity politics has either caught up with the right or that the gap is diminishing. The article considers various possible explanations for unity on these issues – including personality distribution, party homogeneity, and message infrastructure – and shows that partisan spillover in the context of polarization helps explains the closing of the gap in unity between the right and the left. In an era of polarization, Democratic affiliation induces warmer feeling toward stigmatized coalition partners. Groups that may have joined the Democratic party on a single group interest claim (race, gender, religion, class) will gradually move toward greater acceptance of other group interest claims supported by the party. These findings have implications for the oft-stated strategic claim that the left needs to focus on class redistribution over identity politics if the left does not want to be fractured. [ABSTRACT FROM AUTHOR]