It means that she can govern and she can start here, [on] day one, more experienced than any non-vice president*(1) has ever been who aspires to this office. Her strengths, in terms of the ability to debate, the ability to, I think, project genuine concern in smaller groups*(2) and to interact with people, where folks realize she’s really warm and funny and engaging—I'm thinking that the word is getting out that the case against her is good enough that having Loretta Lynch simply ignore it isn't going to work. I would also not be terribly surprised to hear about a White House meeting involving Mike Bloomberg to discuss "something".
*1: Take a hint Joe.
*2: Small groups. The people she can talk to in the adjacent cells.