 The event overall was widely described as having little effect on the 2008 presidential race, although a CBS News poll found that the presidential race tightened following the vice-presidential debate, with the Obama-Biden lead falling from 9 points to 4 points.The debate's format offered moderator Gwen Ifill great freedom and power to decide the questions which can cover domestic or international issues.On the day before the debate, it gained wide media attention that Ifill had authored a new book "The Breakthrough