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By Philip Bump, Washington Post

We can show that fairly easily by comparing the unregistered population (from PRRI) with the density of the Hispanic population in each state (from the Census Bureau). We’ve done the same with black population density, for comparison. As Hispanic population density increases, so do non-registered rates. A black population density rises — it has no effect. (Each dot is data from one state.)
There are two reasons for this. First, Hispanic residents have lower citizenship rates. And, second, even among citizens, registration rates are lower. Using voter registration data from the Census Bureau for the 2012 election, we can compare those rates.

(Since the population of Asian residents is significantly smaller, there is a much smaller effect on statewide registration rates.)
Another way of looking at it: In most states for which there are enough Hispanic residents to be statistically significant, registration in that community in 2012 trailed overall registration significantly.

This is another reason why the threat posed to Republicans by America’s shifting demographics is a lot further away than a year and 10 months.
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