The biggest takeaways from the Biden-Sanders coronavirus debate

Joe Biden and Bernie Sanders had the debate to themselves Sunday night, but a new interloper - coronavirus - took center stage from the start.

The debate over how to address the pandemic neatly highlighted the cores of both campaigns: Biden touted his experience and contended that he is best able to unify the country to take action, while Sanders argued that the virus has illuminated severe deficiencies in the American economy and social safety net that only his "political revolution" can fix.

But the two-hour contest quickly expanded to take in other territory as well. Sanders tore at Biden's long Senate record - including past positions on abortion and the Iraq War - in an effort to change the tide of the Democratic presidential primary, which has seen Biden build up a delegate lead this month. And Biden criticized Sanders' past gun votes and his statements on Cuba and other authoritarian governments.