I think Sandel is the closest person we have to Neil deGrasse Tyson, but he's not nearly as good or famous. It may utlimately be that because they way philosophy is, it can never be as popular as science. Nevertheless, I still think more can be done. A couple of my professors have told me that most political philosophers aren't really passionate about what they write. They'll fine a niche and get really good at writing about it, but they're not really passionate. I find that very disheartening. Perhaps the requirements to publish reliquishes the fire that once burned inside of them, or perhaps they never really cared that much about rectifying injustice to begin with. Either way, the more I learn about academia, the more I think the reason why we don't have a political philosopher celebrity is because the people in the field lack the will.