I agree with you. They would rather have Trump as the President instead of Bernie. This Tara Reid business is going to get interesting. Should someone who has an allegation that may be proved run for the presidency? If there is enough evidence then obviously he should not even at this moment in time it has not been proven in a court of law. I didn't think or knew there was evidence like her mother calling CNN. This changes the situation a lot.
If more of this is true Biden should withdraw himself and I don't think he is that averse to doing so but would be under tremendous pressure by the centrists not to withdraw. If he does then Bernie should get the nomination as he is the runner up. But knowing how Dems operate they will probably nominate Hillary Clinton again.
So far this is more so a twitter story, and not nearly enough to compel a major party candidate to drop out. In fact, I would guess that Biden will stay in even if legitimate evidence actually comes out - he will always be able to either deny it or partially admit and apologize, just like two of the previous four Presidents did during their successful Presidential campaigns.