The political chatter intensified when Kerry addressed supporters during a barbecue at his wife's farm near Pittsburgh, Pennsylvania.

"I'm heading out to Indianapolis to give a speech tomorrow, but before I go we're gonna do a little rally here in Pittsburgh at Market Square, so if any of you can make it, I'm told the gates open at 7 in the morning -- if you're up at that hour -- but at 9 o'clock tomorrow we're gonna have some fun, and then we'll head out to the Midwest again and back on the trail."

Democratic sources close to the campaign told CNN that barring a last-minute hitch, Kerry will use the rally to announce his choice.