For generations, ambitious politicians have dreamed about having the power to run Europe — but as Angela Merkel can attest, it’s a horrible job. She didn’t want to end up with the continent’s problems on her shoulders, but things have ended up that way. The Greek economic implosion, the seemingly unstoppable wave of immigrants from north Africa, the menace of Russian aggression, the euro crisis — all the multiple, interconnected, crises battering Europe have ended up as Merkel’s problem.