Trump botched John Hinckley Jr.'s first name but was corrected by reporters.
Prosecutors dropped all charges against the remaining police officers charged in the case.
Some voters are uncomfortable with a woman seeking a job held by men, CNN commentator states.
Joe Scarborough led the applause and said it was a "great honor" to have Biden as a guest.
Three officers had previously been acquitted.
The would-be assassin of President Ronald Reagan could be free as soon as next week.
"It's not something that he has spoken about," she said.
He also criticized Democrats for not talking about debt or education.
"Nor should he, based on his background," Biden says.
Stabenow said Trump lacks the knowledge to be commander in chief.