Stephen Colbert, the satirical talk-show host, may not have gotten very far with his short-lived, tongue-in-cheek bid for the presidency last fall, but it appears he might have a future as a Democratic fund raiser.

A political scientist has found that Democratic politicians who appear on Mr. Colbert’s show, The Colbert Report, enjoy a significant increase in the number and total amount of donations their campaigns receive over the next 30 to 40 days after their appearance.

James H. Fowler, an associate professor of political science at the University of California at San Diego, compared the donations to candidates who appeared on the show, in which Mr. Colbert portrays a right-wing pundit, to similar candidates who did not.

Democrats who were on the program received an average of $8,247 more than similar candidates who were not by the 32nd day following their appearance, Mr. Fowler found. That represented about two-fifths more than they would otherwise be expected to received.

At the same time, an appearance on The Colbert Report hasn’t seemed to benefit the campaign coffers of Republican candidates at all, according to Mr. Fowler’s analysis. In fact, he said, those candidates actually tended to receive more money in the month before being on the show than they did the month after.

Mr. Fowler’s research appears in the July issue of PS: Political Science & Politics, a journal of the American Political Science Association.