Biden's COVID-19 Challenge: 100M Vaccinations in the First 100 Days.

It’s in the nature of presidential candidates and new presidents to promise big things. Just months after his 1961 inauguration, President John F. Kennedy vowed to send a man to the moon by the end of the decade. That pledge was kept, but many others haven’t been, such as candidate Bill Clinton’s promise to provide universal healthcare and presidential hopeful George H.W. Bush’s guarantee of no new taxes.

Now, during a once-in-a-century pandemic, incoming President Joe Biden has promised to provide 100 million COVID-19 vaccinations in his first 100 days in office.

“This team will help get … at least 100 million COVID vaccine shots into the arms of the American people in the first 100 days,” Biden said during a Dec. 8 news conference introducing key members of his health team.

When first asked about his pledge, the Biden team said the president-elect meant 50 million people would get their two-dose regimen. The incoming administration has since updated this plan, saying it will release vaccine doses as soon as they’re available instead of holding back some of that supply for second doses.

Either way, Biden may run into difficulty meeting that 100 million mark.