She’s used it in the past with her old employer and believe it or not, when she sued the contractor who built her house:

Diann Burns, Chicago’s highest paid television news reader, and her husband recently built a $3 million mansion in the swank Lincoln Park area. Monday’s Chicago Sun-Times reported the couple is now suing the contractor for inferior work. Disputes between contractors and homeowners are common. In this instance, though, Ms. Burns saw something more insidious than shoddy work. So she whipped out that trusty racism card faster than you can say teleprompter. In the lawsuit, the couple claims the contractor did a lousy job because of a belief that black owners wouldn’t notice. Court documents reviewed by the Sun-Times charge the contractor thought Diann and her very successful talent agent husband were “gullible and inexperienced in construction matters” and that the contractor could “deceive and take advantage of and defraud” them.