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Stephen Colbert touts sister’s congressional campaign (VIDEO)

Comedy Central's Stephen Colbert is not the only one in his family with an eye on politics. His sister, Elizabeth Colbert-Busch, is running in the upcoming South Carolina 1st District special election. On Wednesday, Colbert took some time on his show to shine some national spotlight on his big sister's campaign.

"No free airtime, Lulu," Colbert said, referring to his sister by her childhood nickname. "As a broadcast journalist, I am obligated to maintain pure objectivity. It doesn't matter that my sister is intelligent, hardworking, compassionate and dedicated to the people of South Carolina."

Colbert-Busch, who is running as a Democrat, faces an uphill climb in the GOP-leaning district. President Obama won just 40 percent of the vote there last year.

Colbert offered some advice to Republicans who might end up in a debate with his sister. "This is how I used to win a lot of arguments with her when I was a kid," he said. "Right after she makes a good point, repeat it back to her in a dumb voice."