The Cannes Film Festival got off to a lively start with Sean Penn, president of this year's jury, sounding off about US Presidential hopeful Barack Obama and the opening movie almost being upstaged by a bunch of performing pandas.

Penn joined fellow judge Natalie Portman on the red carpet for the premiere of the first night film, Blindness, a thriller starring Julianne Moore.

At a press conference beforehand, the actor, an outspoken critic of the Bush administration, offered his views on the Democratic nomination race.

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Asked if he would be joining other Hollywood A-listers in pledging support for Obama, Penn gave him a less than ringing endorsement and warned that he has an awful lot to live up to.

”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.”

Portman, 26, said she would not be endorsing Obama or his rival, Hillary Clinton, but added: “I think it's a very exciting year for our politics, that for the first time in a while we have a choice of who we like better instead of who we hate least.”

Penn said it was impossible to separate film from politics, and promised that the winning film would be a reflection of the current climate.

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