Findings from 538.com breaks down some of the data on all car dealers.
http://www.fivethirtyeight.com/2009/05/news-flash-car-dealers-are-republicans.html
Overall, 88 percent of the contributions from car dealers went to Republican candidates and just 12 percent to Democratic candidates. By comparison, the list of dealers on Doug Ross’s list gave 92 percent of their money to Republicans.
FiveThirtyEight is a moonbat site. Can’t say that I’d trust their numbers.