Just a year ago, working as a product presenter at an auto show was a pretty straightforward job. You stood next to a vehicle, you called it a marvel of engineering, style and comfort and then you fielded softball questions like, “What does this baby cost?” But that was before the bailout. Now that the government has helped General Motors and Chrysler stave off bankruptcy with billions of dollars in loans, these companies are finding somewhat hostile crowds at their exhibits. Which leads to scenes like the one on Friday at the New York auto show, where a blond woman...