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My interview with Sharansky reminded me of the conversation I moderated Tuesday night with renowned American law professor Alan Dershowitz at a public event in Ra’anana.During our hour-long talk, Dershowitz – one of Israel’s strongest and greatest defenders and advocates – mentioned how when he comes to Israel he meets regularly with the prime minister, an old and close friend. Last week, he said, he and his wife had a five-hour dinner with the Netanyahus at the Prime Minister’s Residence in Jerusalem.When I asked whether he thought Netanyahu was sincere about making peace, his answer was unequivocal. “Absolutely,” Dershowitz said. “Not only do I think it. I think I know it.”Netanyahu, he said, wants to be “Nixon in China” and bring peace to Israel. But the problem, he went on, is that the “Israeli political system is broken.” While the president of the United States is the “chief executive,” in Israel, the prime minister puts together a cabinet where half of the ministers want to stab him in the back and the other half want to run against him.The same explanation that Dershowitz gave for the difficulty in making peace is what Netanyahu has been giving to American Jewish leaders urging that he implement the Kotel plan, voted on and approved by the cabinet in January. Netanyahu, who is one of the few politicians in Israel who really does get the importance of the Diaspora, is simply not willing to risk his government for it.I appreciate Netanyahu’s political predicament, but it cannot be used as an excuse forever. At some point, leaders need to lead and make decisions. They cannot stay bogged down by political challenges.After eight years as prime minister, we know that Netanyahu is a brilliant politician. Now is the time to see him as a great implementer.As Sharansky said – our united Jewish journey depends on it.