It's fairly easy to imagine the attacks that Trump will land against Sanders, which would work to discredit him through fear.

I don't think you'll see that with Biden. Sanders' campaign would quickly fall apart under the weight of those attacks.

Also, I'm tired of hearing this senile line. It's a form of ageism. He's never been a talented public speaker, specifically when he's not feeding off the energy of a crowd. Just go back and look at his old speeches.

If you are looking for a young, vibrant candidate, neither Sanders or Biden is your ticket, anyway. Sanders is older than Biden.