Significant concerns over Biden's physical and mental fitness for presidency exist.
Polls show significant and increasing disapproval of Biden.
Biden has dismissed these concerns and continues to insist that he is the best Democrat to defeat Trump.
There is a call for other Democratic leaders to publicly address these concerns.
By withdrawing, Biden could focus public attention on whether Trump is fit for the job.
Democrats need a candidate who can present a compelling alternative to Trump's vision for America.
Conclusion: There is an urgent call for Biden to contemplate his role and acknowledge that he could be more useful to his party by stepping aside to allow new leadership.