Sen. Coons previews DNC speech: Biden 'will be a president for all Americans'

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Senator Chris Coons (D-DE) joins Andrea Mitchell to preview what he'll say about Joe Biden at tonight's Democratic National Convention, telling Andrea that about "the ways in which I've seen him provide a shoulder to cry on, or a partner in prayer or folks who come to him, expressing grief and loss. And frankly, the ways in which he will be a president for all Americans."