Sean Penn loves dictators, especially if they are anti-American leftists. Recently, the Hollywood star visited Venezuela to campaign for strongman Hugo Chavez. Mr. Penn joined Mr. Chavez at a major rally in the city of Valencia. The actor has been a longtime friend of the despot. With Venezuelans going to the polls on Oct. 7, Mr. Penn came to bolster Mr. Chavez’s re-election efforts. He should be ashamed; Mr. Penn’s actions border on treason. “Thank you very much for visiting us again, dear friend,” Mr. Chavez said, while introducing Mr. Penn in front of a large crowd. “We're all Americans,...