Only 40 percent of voters surveyed agreed with the statement that Biden “is in good health,” while 50 percent disagreed. That 10-percentage-point gap — outside the poll’s margin of error — represents a massive 29-point shift since October 2020, when Morning Consult last surveyed the question and found voters believed Biden was in good health by a 19-point margin.

Asked whether Biden is mentally fit, voters are almost evenly split, with 46 percent saying he is and 48 percent disagreeing. But that negative 2-point margin stands in stark contrast to Biden’s numbers last October, when voters believed he was mentally fit by a 21-point margin…

A recent Harvard-Harris poll found that 53 percent of voters said they had doubts about Biden’s fitness and 47 percent did not. Asked if Biden is too old to be president, 58 percent said he was and 42 percent said he was fit enough.