The reason Kadima did not join the coalition initially is that Netnayahu ran for elections on a policy of "no Palestinian state" (only autonomy), and he was not ready to expose himself as a fraud right after the elections and announce that he actually accepts a Palestinian state. That took him 4 months to do (in a speech in June 2009). But now, that his policy is similar to Kadima, they can join. Why don't they? They want their share of ministries, which can be found only if the Lieberman party is ejected from the Coalition. Fair enough, because Lieberman is not going to support sincere peace negotiations. Why doesn't Netanyahu simply remove Lieberman and his party from the government? here is another problem: Netanyahu is a political coward. He is afraid that the hardliners in Likud will join Lieberman and that after the next elections, the Lieberman party will be the largest. Netanyahu is not courageous enough and sincere enough to do what is right. He is now waiting for the Attorney General to decide whether Lieberman should be indicted for corruption, as the police investigators and the state prosecutor have recommended. The final decision will come in less than half a year. If Lieberman is indicted, he will be out of the political system for a few years, so Netanyahu will then bring in Kadima. As long as he doesn't take political risks, Netanyahu feels strong...
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from the article: Freeze Lieberman