Not all of them have necessarily said much at all about it. Some have, generally pro-Israel as you'd expect. But if the standard is not being aligned with the most strongly anti-Israel on it, that's a bar that would exclude Biden, Harris herself, and lots of other Democrats who will be speaking.

I don't think that needs to be the standard, but there are a lot of people just looking for a reason right now not to vote Democrat. Joe is moving on and Kamala's / mainstream Democrat's views are baked into the polling. Don't pick at that scab.