A problem with this poll is that some companies are split into their constituent brands and some are not.
Cadillac, Pontiac, GMC, Chevrolet, Saturn, Hummer, Oldsmobile are listed separately.
Toyota, Lexus, Scion, WiLL are combined into "Toyota"
I don't think we have enough voters to properly divide the brands, but at the same time voting for your favourite in each continent's "big three" doesn't develop into anything meaningful.
Also, Volkswagen (and Skoda) are missing despite Audi, Porsche, Seat being present.