Movie star George Clooney is convinced he ruined John Kerry's chances in the race for US president in 2004 - by snubbing an invitation and hurting his feelings.

The OCEAN'S TWELVE actor was one of several screen stars invited to ride on Kerry's election train, but it all went downhill for the Democrat when Clooney stayed away.

He recalls, "Kerry asked me to ride on his train - he had a train going cross-country after he was nominated and some actors went on board.

"I called him and explained that I couldn't do it.

"I'd hurt him. I'd actually caused him harm at the polls."