So I stumbled upon a map at Amazon, based on top selling books by state, whether conservative books or liberal books. It is a fun map, though predictive it is not. They explain:
In recent years, thanks to the color-coded maps the networks use on election night, “red state” has come to represent a state favoring the Republican Party, while “blue state” represents one that favors the Democratic Party. We know that states are not all red or all blue, and readers aren’t either. And books are often too complex to fit into such neat categories. But given the high interest we’ve seen in political books during election years, we thought our customers would like to see what general book buying patterns emerge across the country, and how they change over time.
Alas I cannot figure out how to copy their image over here, but if you click on the quote above, it will take you over to the map. My state of Indiana is 59% ‘Red’ books and 41% ‘Blue’ books, while my other home state of Wisconsin is 52% ‘Red’ books and 48% ‘Blue’ books.