text: SHOPTLAK: A Phrase That Heals All Wounds (AdWeek.com) AdWeek.com - No one in advertising can doubt the power of juvenile humor. Now, Marvin Waldman wants to put it to good use. The former executive creative director at Young   Rubicam in New York, who left in 1999 to focus on social-marketing projects, has come up with a bumper sticker and Web site introducing a phrase he says can bring Democrats and Republicans together: "Cheney is a Dick."