In the Illinois senatorial debate Oct. 27, 2016, incumbent Sen. Mark Kirk responded to a challenge about foreign policy with a shocking joke that mocked opponent Tammy Duckworth's mixed-race heritage.

Photo by Gabriella Demczuk/Getty Images.

Duckworth, who was born in Thailand and lost both legs while serving in Iraq, was touting her qualifications in evaluating the need for future military action, citing her family's long history of service:

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