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President Barack Obama huddled with President Hamid Karzai in Chicago on Sunday, urging Afghanistan’s leader to accelerate negotiations with the Taliban over a political solution to the longest war in America’s history. But the prospect for Karzai negotiating successfully with the insurgents is clouded by a question raised by Josef Stalin, on the eve of World War II, in response to the suggestion that he offer concessions to the Pope: “How many divisions does he have?” The Taliban now ask the same question about Karzai. And should the Afghan leader also ask himself the question, he might reach a similarly dispiriting conclusion. Karzai’s independent power base is minimal, as is his ability to influence the outcome of his country’s civil war...