This graph illustrates clearly relation of tendancy to vote and intelligence. There are two large areas of Democrat voters on the lower areas of the graph, the low IQ and high. The low IQ is the larger one on the left which obviously includes the minorities of the Democrat base, followed by the large area of average IQ voters (and presumably white) which makes up the lion's share of the Republican base and the middle class. The second but smaller area of Democrat supporters consists of the academic elite, East Asians and Jews.
The Link Between IQ and Conciousness
Sorry but considering that the map shown of global distribution of IQ by country is considerably off, I know because I have a better source, I tend to discount the rest of the article from being accurate either. BTW, your bell curve has no X axis, so tells us little. Garbage fake news.