Automakers attempting the tough sell of "dirty" diesel cars to skeptical American drivers can take a cue from an award-winning U.K. spot for Honda by Wieden + Kennedy, London. The ad features Garrison Keillor, host of National Public Radio's "A Prairie Home Companion," crooning the original folk ditty, "Can Hate Be Good?", accompanied by animation of bunnies, flowers and rainbows.

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