President Bush flew to Iraq yesterday to assess for himself progress in quelling the insurgency. Next week, the top military commander will report on the success of the surge. It will be a pivotal moment for the Bush presidency, the 2008 election and the entire nation. What will General Petraeus say and how will Bush balance politics and national security? Demetri Sevastopulo, who covers the Pentagon for the Financial Times, is traveling with the President and Defense Secretary Gates.