Here is where the two candidates stand on some of the issues each may raise.

Health care

Biden

One of the biggest distinctions between the candidates is that Mr. Biden does not support a universal government-run health insurance program like “Medicare for all.” Instead, he supports maintaining the private insurance system but adding a Medicare-like public option that anyone could sign up for — a proposal that still goes well beyond the Affordable Care Act. He estimates his plan would cost $750 billion over a decade.

Mr. Biden would also increase tax credits for people to buy insurance through the Affordable Care Act marketplace. His plan doesn’t specifically address medical debt.

Sanders

One of the bedrock principles of Mr. Sanders’s campaign is that health care is a human right, and he is the torchbearer for Medicare for all. He estimates his plan would cost about $30 trillion over 10 years and would be paid for by new revenue of about $17.5 trillion, along with “current federal, state and local government spending.”

He also wants to eliminate $81 billion in medical debt.

Coronavirus

Biden

The new coronavirus has quickly become the most urgent problem facing the country, and Mr. Biden released a plan on Thursday calling for free testing, “the elimination of all cost barriers to preventive care and treatment for Covid-19,” and emergency paid leave for affected workers.

He also wants to restore a White House office that oversaw responses to global health crises — an office that the Obama administration created and the Trump administration eliminated — and direct the Justice Department to combat price gouging for medical supplies.