EMPORIA, Va. - Barack Obama says he's decided on a running mate, but he won't say who.

"I've made the selection, that's all you're gonna get," Obama said told reporters while campaigning in Virginia Thursday.

Obama didn't say whether he's informed his pick yet.

Obama is planning to announce his choice in a text message to supporters sometime before Saturday afternoon, when he's scheduled to appear with his pick in Illinois.

Asked by an Associated Press reporter when the text would be sent, Obama just grinned and said, "Wouldn't you like to know?"

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