September was the biggest monthly decline in the IBD/TIPP Presidential Leadership Index's history, plunging 9.3 points, from 58.7 to 49.8, a 15.8 percent decline.
President Biden's decline surpasses President George W. Bush's previous monthly record of 15.6% set in the aftermath of Hurricane Katrina in September 2005.
It is also the largest monthly point drop, surpassing President Bush's April 2001 drop of 8.7 points.
