a) He gives thoughtful interviews frequently to the mainstream press so that we can feel like we have some understanding of the thought processes of those in office. It makes me feel positive about America and politics in a way I never previously considered possible.
b) He doesn't dumb thoughts down, avoid complexity, or hedge on hard questions. You get the sense that he is actually trying to answer questions honestly.
c) He's not afraid to be ambitious ("But part of my job I think is to bridge that gap between the status quo and what we know we have to do for our future.")