Republicans buy American. Democrats, not so much:

The Volvo-driving liberal and the redneck in a Chevy pickup are long-held stereotypes. But a map of car ownership – produced by R.L. Polk & Co. — overlaid on the electoral map reveals the surprising extent to which how we vote corresponds with what we drive.
Blue-staters on each coast, from Los Angeles to Seattle and from Boston to the District, are the most likely to drive foreign cars. Domestic brands have their highest levels of market share in the mostly conservative interior of the country.
In some blue states — where a Democrat has won at least three of the last four presidential contests — foreign cars have as much as 60 percent of the market, as measured by vehicle registrations. It is mostly in red states — Republican strongholds — where domestic cars have 74 percent of the market or more.

And even Purple-Americans buy American:

The three politically purple states — those that have evenly split the last four elections — strongly prefer domestic cars.