Kamala Harris’ post-debate surge is now showing in the polls

LIKE BIRD WATCHERS Observers of the American presidential campaign have their eyes glued to opinion polls to see if they can spot a post-debate rebound for either candidate. Now they can. The economistSurvey trackingKamala Harris’s national lead over Donald Trump has widened to 4.5 percentage points, up from 3.8 points on September 10, the day of their debate. A 0.7-point improvement is small but potentially significant, and gives Ms. Harris her largest lead yet in our tracker (see chart).