What if he says he will announce it at the convention?
See tagline. I’ve always said it will be a brokered convention.
Even if Creepy Uncle Joe does it make it to the convention, there is no guarantee he won’t make it past the nomination process.
If he is nominated? It will only be because Hillary or Michelle will be his running mate. Which will be a clear signal to the entire world that Hillary or Michelle will be the real president.