Sen. Joe BidenJoe BidenBiden tells Colbert: I don't plan to run in 2020 Biden on running for president in 2020: 'Never say never' Overnight Regulation: Biz groups push reg reform in new Congress MORE (D-Del.), on a 2008 presidential campaign stop in Iowa, told his audience that he's going to be "straight up" with Americans about the genocide in Sudan.

"The next president of the United States is not going to have a chance for on the job training like this last one..." Biden said. "I warn you, if I am your president, I will do more than talk about Darfur."