A Michigan congressman is defending the U.S. auto industry against calls for increased fuel efficiency by criticizing a famous foe of global warming: California Gov. Arnold Schwarzenegger. Republican Rep. Joe Knollenberg's re-election campaign placed a billboard along a busy interstate in Detroit that reads, "Arnold to Michigan: Drop Dead!" It shows a grim-looking picture of the actor-turned-politician and draws attention to Knollenberg's Web site. "Michigan and the Big Three are being unfairly bullied by politicians who have no understanding of auto manufacturing," Knollenberg said Thursday in a statement. Knollenberg said he "picked on Schwarzenegger because he's a perfect symbol of...