You will lose more voters from having Dick Cheney speak at the DNC than you will gain. A lot of Biden's bad numbers had to do with Gaza and you will deactivate them again if you parade a bunch of neocons onto the stage for an entire night. Bad idea

I wouldn't use Dick Cheney, either. But Colin Powell spoke to the 2020 DNC, as did John Kasich. I'm not suggesting anything more than going from a couple like that to maybe four or five of the most palatable and prominent, from the many who are available.