And this person thinks Trump has nothing to lose, and Sanders and Clinton have everything to lose. hmmmmm
What the hell are you doing, Bernie? The Vermont senator inexplicably agrees to debate Donald Trump - Salon.com

Now all of this debate talk may be just that – talk. Nothing formal has been announced and it’s entirely likely this never happens. Indeed, there are reports today that Trump is backing off his comments. If true, I’m not sure why. This is a no-lose proposition for him. It doesn’t matter how poorly he performs, his supporters won’t care and Republicans aren’t switching sides. This is an opportunity for Trump to take the sledgehammer to Clinton alongside a fellow Democrat.

From Sanders’s perspective, it’s not clear what’s to be gained. Even if he thrashes Trump at the debate, nothing changes. He might get a bump in the polls and perhaps even win California narrowly, but he’ll still lose the Democratic nomination. Worse still, he’ll lose any credibility he has within the party, and thus any chance he has to improve it. Whether he wants to or not, Sanders will be forced in a debate like this – by the moderator and his opponent – to bash Clinton and the Democratic Party.