Pickup trucks customized to spew black smoke into the air are quickly becoming the newest weapon in the culture wars. "Coal Rollers" are diesel trucks modified with chimneys and equipment that can force extra fuel into the engine causing dark black smoke to pour out of the chimney stacks. These modifications are not new, but as Slate's Dave Weigel pointed out on Thursday, "rolling coal" has begun to take on a political dimension with pickup drivers increasingly viewing their smokestacks as a form of protest against environmentalists and Obama administration emissions regulations. Last month, Vocativ noted many coal rollers focus...