Season 4: "Negative Advertising"

22 May 2010 -- Season 4: "Negative Advertising" -- Attack ads have become the staple of political campaigns. Now negative advertising is gaining in popularity throughout the ad business. But do negative ads work? This week, Terry O'Reilly explores the attraction- and danger- of ads that take shots at rivals. He shows how some great campaigns are negative without seeming negative. And he'll recall some notable negative campaigns that backfired.