All of the above. Dems are *more* linked to Auto and Health and Wall Street, GOP are *more* linked to Military, Banking and Oil. But both parties are closely intertwined with all 6 of the above examples and examples can readily be found for both parties being involved with favors, lobbying and money from any sector mentioned here.

For who could be free when every other man's humour might domineer over him? - John Locke (2nd Treatise, sect 57)