By Fred Allan Nyankuru  There is a saying in football that every good striker is not automatically a good coach. Likewise, in politics, every brilliant politician is not automatically presidential. I recently Edwin Sifuna's interview on Citizen TV with genuine interest. I wanted to hear not just the fiery senator we have grown accustomed to, but a man who could convince Kenyans that he possesses the depth, judgement and temperament required to lead our nation. By the time the interview ended, I walked away with one conclusion: Sifuna is a gifted politician, but he has not yet convinced me that he is ready for State House. Let me be clear. This is not a personal attack. In fact, I have consistently admired Sifuna's confidence, courage and ability to articulate himself. Few politicians in Kenya can match his command of language or his quick wit. He has mastered the art of political combat. If politics were a courtroom, Sifuna would be among the finest advocates. But the presidenc...