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Comedian Stephen Colbert broke his silence about his sister's congressional campaign last night, acknowledging on his show that his sister, Elizabeth Colbert Busch, is seeking the Democratic nomination in the First District of their home state of South Carolina.

"As a broadcast journalist, I'm 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 joked, on Wednesday's episode of the "Colbert Report."

Colbert also took the opportunity to mock some of his sister's rivals for the seat, particularly former Gov. Mark Sanford, who he called the "former governor of the Appalachian trail."

Colbert Busch said in a tweet last month that her younger brother will help out with fundraising, but her campaign declined to say whether that will come in the form of a fundraising letter or even a visit to the state. It's also unclear when Colbert will make the push, but with just over a month to go before the primary, it is likely to be soon.

Colbert Busch is a wildcard in the race who, with her brother's help and name, could easily bypass her relatively unknown Democratic opponents in the March 19 primary. With the 16-candidate Republican primary widely expected to go into a runoff, which could drain the resources of the eventual GOP nominee, that money could be critical for Colbert Busch in the general election.

Still, the district is heavily Republican and any Democrat will have an uphill climb in May.