This comports with what I've generally observed in my research on race and immigration attitudes: it's not that the avg. Republican has gotten all that more conservative (of course, you will find exceptions) on the issues. It's rather that Dems have moved much more quickly.. 
...in the liberal direction. Paper here: journals.sagepub.com/doi/pdf/10.117…
A lot of our polarization is thus Dems resenting the fact that Reps aren't 'keeping the pace' (and Reps resenting Dems for running too far ahead).
One other point I forgot to add: the paper finds that much of the divergence is limited to white partisans (with white democrats becoming more liberal than white republicans are becoming conservative). I've observed similarly in my own data.
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