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TAMPA, FL (AP)-- In a bizarre turn for a political convention, Clint Eastwood carried out an imaginary conversation with Barack Obama, represented by an empty stool onstage.

The Dirty Harry actor's performance ranged from biting to rambling, with lots of jokes and a salty touch.

"I've got Mr. Obama sitting here and I was going to ask him a couple of questions," Eastwood told the delegates, gesturing to the stool, before pretending to question Obama about the wars in Iraq and Afghanistan and whether he should have tried to close the Guantanamo Bay prison for terror suspects.

At one point he "listened" to the imaginary Obama lash out at Romney - leaving the president's side of the conversation to the audience's imagination.

"He can't do that to himself. You're absolutely crazy!" Eastwood reacted. "You're getting as bad as Biden."

Stern-faced Romney aides winced at times as Eastwood's remarks stretched on. On a night where virtually every moment was scripted, Eastwood was among the only speakers not reading from a teleprompter as he spoke. It was blank.