Commentary A new report from Pew Research shows that the sharpest drop in approval for President Joe Biden is among the Democratic Party’s most loyal and consistent supporters—black protestants. In March 2021, shortly after he took office, Biden’s support among black protestants stood at 92 percent. By January 2022, this was down to 65 percent, a drop of 27 points. Over the same period, overall national approval for the president, per Gallup, was down from 54 percent to 40 percent—14 points. About half the drop among black protestants. Other polls among all black voters tell the same story. An NBC poll shows black approval for Biden dropping from 83 percent last April to 64 percent now. A Quinnipiac University poll shows black approval during Biden’s first year in office dropping from 78 percent to 57 percent. What’s going on? Should Democratic strategists be worried that a sea-change is occurring among …