I knew this was going to happen, I said it the day Joe dropped out. People voting uncommitted were a mixed demographic of actual principled voters standing against a genocide, and disillusioned liberals who wanted anyone but Joe Biden to run. I believe the latter is the larger group. Like others have said after the fact, Kamala ticks all the liberal identity boxes, and now, Waltz also slots right in to cover all the other groups.
My understanding, too, is that the rest of the audience tried to shout them down, which is telling. The way this was relayed to me when I first heard about it was via a TikTok where the commentator referred to the chanters as "Hecklers", also telling. Reports are, Harris, before taking the stage, spoke with leaders of the uncommitted group and wanted to get contact information to start a dialog, expressing interest in a possible arms embargo against Israel (I have not verified this) See this comment for more details.
But if that was true, why is this the response she gives to their chants? What is she signaling in this moment? She's clearly not talking to them, but instead talking to everyone else in the room. Her words are painting the chanters as opposition. She tries at least one time before this comment to calm their chants. Did they get under her skin, and is this a raw reaction to their disruption? Is it a calculated message? Either could be true.
If she really was trying to make a connection with this group of voters before getting on stage, then why did she not take the opportunity to address the issue? Why not say on stage that she is coordinating conversations with their group, that she wants to hear them out directly, and that their concerns are valid? Either this is a true showing of her actual political savvy (as in, a lack thereof), or she is giving up the game right here in front of them.
Regardless of intention, the message is loud and clear. Vocal support for an anti-genocide position from her is in opposition to their campaign. Even if she doesn't believe that, her words imply it. As others have pointed out, Michigan is an important state, and the voters who can make or break their chances are not white well-meaning liberals, they are Muslim Americans who have real stakes at play. The position of the next president on Israels Genocide have real, material impact on them, and I doubt they will remain silent about it.