A panel of CNN experts sought to make sense of how the presidential race is being reshaped, as Vice President Kamala Harris took the stage in Milwaukee for a packed rally. “This is a prosecutor making her case,” said reporter Jeff Zeleny. “This is also the same vice president who has been out there really for the last three years making speeches, but not when she is at the top of the ticket, something has changed obviously. Now this is her burden. This is her case. And often when the vice president has been out there — I’ve been at several of her rallies, she’s been talking about the Affordabl…