What? The non-white vote has increased as a percentage of the Democratic primary electorate in every state except (strangely) Virginia.
I think that probably has something to do with a combination of two factors:
1. non-white voter growth in Virginia has been somewhat slower than a host of other states - African American growth is relatively static and Hispanic/Asian growth is decently fast, but they have far lower turnout rates so it takes longer for their actual voter numbers to catch up
2. Virginia has had a lot of migration from other liberal states which was important in its change from reliably red to reliably blue. A lot of these people aren't necessarily minorities so their increasing numbers has sort of offset the gains in non-white primary voters. Other states with increasing non-white primary voters don't usually have this mitigating factor.
And in regards to other states with increasing non-white primary voters - If you mean places like minority-rich Southern states, then you have to consider that after Obama, white voter support for Democrats collapsed in parts of the South, which would lead to an increase in the number of non-white primary voters relative to the entire primary electorate. Not necessarily because their numbers increased, but rather that white democrat numbers decreased.
