Comedy Central's Stephen Colbert praised his older sister Elizabeth Colbert Busch on Thursday, touting her credentials for a South Carolina House seat as he expressed hope that his own professional activities won't tarnish her character.

"It's natural for her to run because she has skills and something to offer society," Colbert said on NBC's "Late Night With Jimmy Fallon." "I am professionally ridiculous. So I just hope that what I do for a living doesn't sully her good character."

Colbert Busch is running for the Democratic nomination in South Carolina's 1st District special election. As Colbert's sister, Colbert Busch has received more national attention than most House candidates. Colbert recently touted his sister's campaign on his show, "The Colbert Report," in which he portrays a faux-conservative pundit. “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," he said in character earlier this month.

On Fallon's show, Colbert spoke out of character, as he praised his sister's ability to overcome the odds and expressed optimism about her candidacy.

"She's an incredible person," he said. "She raised three kids by herself, on a salary of, like, $14,000 a year. ... Then went to college and made something of herself. And now she's going to be the Democratic nominee from South Carolina."

Colbert is scheduled to attend a pair of fundraisers for his sister -- on Friday in New York and on Saturday in South Carolina.

If Colbert Busch wins the Democratic nomination, she faces a steep uphill climb in the heavily Republican district that gave President Obama only 40 percent of the vote in 2012. But as The Fix's Aaron Blake recently wrote, there are several reasons why she shouldn't be counted out.