David Gergen : Le problème est que Gergen says the polls have tightened , partisans on both sides are fired up . CNN poll gave a slight edge to Paul Ryan ; Gergen says he had edge on style . Gergen : Tuesday 's town hall debate looks increasingly important .
David Gergen : Two debates in two weeks have transformed presidential race . Gergen says the polls have tightened , partisans on both sides are fired up . CNN poll gave a slight edge to Paul Ryan ; Gergen says he had edge on style . Gergen : Tuesday 's town hall debate looks increasingly important .