No matter what message you are about to deliver somewhere, whether it is holding out a hand of friendship, or making clear that you disapprove of something, is the fact that the person sitting across the table is a human being, so the goal is to always establish common ground.
It's okay if you want to go. Everyone wants you to stay. I want you to stay more than I've ever wanted anything in my life. But that's what I want and I could see why it might not be what you want. So I just wanted to tell you that I understand if you go. It's okay if you have to leave us. It's okay if you want to stop fighting.
While eschewing emotion - and its companion, vulnerability - Obama should be careful not to sacrifice empathy, the 'I feel your pain' connection that sustained Clinton. This connection is the shorthand people use to measure their leaders' intentions. If people believe you're on their side, they will trust your decisions.