The more Obama stays true to the words of his Cairo speech—last night, echoing the chants of the Egyptian people, he urged Mubarak to leave now, not in September—the more the rest of the Arab autocrats have to fear:

PARIS — In the latest shock wave emanating from protests across the Arab world, President Ali Abdullah Saleh of Yemen announced on Wednesday that he would not stand for re-election when his term expires in 2013 or try to hand on power to his son, news reports said...

“No extension, no inheritance, no resetting the clock,” Mr. Saleh said in a speech to Parliament, speaking a day before protesters have vowed to stage a large rally in the capital, Sana, called a “day of rage.”