Hu Jintao, the president of China, knocked Barack Obama from the top spot in Forbes magazine list of the world’s most powerful . Obama was No. 1 last year. Russian Prime Minister Vladimir Putin ranks No. 4 on the list, followed by Pope Benedict XVI, German Chancellor Angela Merkel, and British Prime Minister David Cameron. No. 68 on the list is WikiLeaks editor Julian Assange. See who else made it.