Seems a majority of voters don't think so.
A majority of voters don’t think President Joe Biden is mentally and physically capable of doing his job, and suspect the White House is actually being run by others.
www.rasmussenreports.com
Now I know some will hit back because of who the pollster is or because no one wants to believe they voted for a President who might not actually be in charge. But even if the results are skewed a bit, there is still a substantial percentage of voters who don't think he is in charge and someone else is pulling the strings.