After the Assassination Attempt: Harold Meyerson; Kamala: Joan Walsh; plus "Mack the Knife"

After surviving the assassination attempt: Is Trump capable of sticking with his new feeling of gratitude, calm, and unity, or are anger and megalomania built into his DNA? Harold Meyerson comments.

Also: Kamala Harris – could she replace Biden on the ticket?  Should she?  Joan Walsh has our report.

Plus, from the archives: the song “Mack the Knife” from Berthold Brecht in 1928, to the Off Broadway revival of Threepenny Opera in 1955, to Sonny Rollins in 1956, to Bobby Darrin in 1960: we will listen, and Will Friedwald will explain.