Right now, the world is understandably focused on Donald Trump's revelation that he has been diagnosed with Covid-19. Just how sick is the president? How will it affect the presidential campaign? The questions are virtually endless in this historically unprecedented moment.

At the same time, we are witnessing yet another example of how Joe Biden would behave if he becomes president next January. The results speak for themselves: This is what a president looks like.

Putting politics aside, Biden's response to Trump's diagnosis and Biden's own transparency at how he hand his family were handling their potential exposure to the virus were a simple and straightforward display of how a public official responds to a crisis. And after nearly four years of Trump as commander-in-chief, that in itself is an unusual moment to behold.

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