The Obama campaign promises a major endorsement will be announced this afternoon, and speculation is that it may be John Edwards.

Meanwhile, as the Cannes Film Festival opened, Sean Penn appeared to be giving Obama his support — but he also took the opportunity to criticize the Democratic front runner.

From the Daily Telegraph:

”I don’t have a candidate I’m supporting and I’m certainly interested and excited by the hope that Barack Obama is inspiring,” he said, but went on to accuse him of a “phenomenally inhuman and unconstitutional” voting record.

”I hope that he will understand, if he is the nominee, the degree of disillusionment that will happen if he doesn’t become a greater man than he will ever be,” Penn said. “This is the most important election, certainly in my lifetime, and maybe ever.”

Penn endorsed Dennis Kucinich before the Ohio congressman dropped out.

With him was Natalie Portman, who declined to give her pick in the presidential race.

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