They are now playing Biden clip from outside his fundraiser in MD.
He is calm but forceful.
"Vice President Biden shouldn't need this lesson," Booker adds.
He is walking through why segregationists used the term 'boy' for blacks but not whites.
He says Biden in a "defensive crouch" and "he knows better."
He compares Biden to Trump in refusing to apologize.
"I know Joe Biden. He's better than this."
"That I should apologize to him?...really problematic."
[fyi, I missed the word(s) before really problematic]
Booker's core message is about bringing people together, and he framed his criticism of Biden in that regard.
And it will be Biden's first joint appearance at a cattle call — with heightened stakes.