Interesting study. Since Bill Clinton left the White House, the Democrats have been steadily moving leftward on economic issues. Now, they are pretty much a quasi-Socialist party. After all, an actual socialist won 43% of the popular vote in the 2016 Democratic primary.
Social/identity encompasses issues such as illegal immigration and radical Islam, key issues that propelled Trump to the victory. The typical Trump voter is definitely not a Romney type fiscal conservative and does not want a major rollback of core safety net such as social security, medicare, medicaid. But they also reject socialism, high taxes, wealth redistribution, and onerous regulations. Of course, there is a contradiction inherent in this viewpoint as the New Deal and Great Society programs are essentially redistribution under a different name.
As many Democrats have pointed out, and it's true, Social Security and Medicare are socialist. GOP supports a little bit of socialism, just like how the main center-right parties of European nations all support their countries' respective welfare states.
