(CNN) - The political world may not yet know who the next Democratic vice presidential candidate will be, but Barack Obama does.
The Illinois senator told USA Today Thursday he has made up his mind on who he will ask to join him on the Democratic presidential ticket.
"Yes," Obama said matter-of-factly when asked if the decision had been made.
But Obama refused to say whether the newly-minted Democratic VP had been informed yet. "I won't comment on anything else until I introduce our running mate to the world," he said. "That's all you're going to get out of me."
Obama is expected to appear at a rally with his running mate in Springfield, Illinois Saturday. It remains unclear just when the campaign will announce the VP choice via text message.
UPDATE: CNN's Chris Welch reports Barack Obama confirmed to reporters in Virginia he has made up his mind.
“I did say that I've made the selection and that's all you're going to get," Obama said.