29% of US citizens believe Obama is a Muslim according to a CNN/ORC poll.
NPR: Trump Does Nothing as Questioner Says Obama is Muslim
There are approximately 321 million US citizens. 29% of 321 million is 93 million.
93 million US citizens believe that Obama is a Muslim.
15% of Democrats and 43% of Republicans believe that Obama is a Muslim.
So, NPR, Trump has done something.