Oh dear. Another week, and another corruption scandal for Ehud Olmert, still managing to drag out his inevitable political demise beyond all reasonable expectations. Now he is suspected of having double-billed for foreign trips as Jerusalem mayor and later as a government minister, using the money to fund his own family holidays. What makes a high-flying, ambitious politician potentially do something not only so low, but frankly so stupid? One can only imagine that it must be greed, arrogance - and confidence that the Israeli political system would let him get away with it.