Voters say Biden's poor debate performance was caused by DEMENTIA

A majority of voters believes that President 's disastrous debate performance last week was not caused by a cold or too much preparation but by dementia.

That is the damning finding of an exclusive poll for DailyMail.com.

Only 10 percent of respondents said they believed a cold was to blame, rejecting the official explanation for why the president struggled to answer questions or hold his train of thought during a 90-minute showdown with .

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