I don't think I'm all that but I do know that Bernie Sanders appeals to what is best in me. That itself is a beautiful thing, worth having, worth living out. We have no guarantee he'll make it through the gates of hell to actually achieve the presidency, but his beautiful, noble effort is entirely worth supporting. Whether he makes it or not, I will never regret doing what I can (nowadays it's mostly financial and rhetorical) to help his mission.
I am reminded of an event that opened my eyes many years ago when I was an abandoned teenager staying with an incredible family so unlike my own that it felt like an "Alice in Wonderland" experience. The mother of this family was getting ready to attend an antiwar protest with the American Friends Service Committee. I asked her why she wanted to do that when she knew it wouldn't make any difference. She said that it meant something to her just to be there with them, just to weigh in on something that mattered to her. I had never heard anyone say anything like that before, and it puzzled me greatly. But it's been rattling around my mind ever since.
This is about so much more than any of us -- but acts like this are one of the ways we define ourselves as people.