Electability. You can have the best platform and positions in the country. However, if you haven't a prayer of getting elected, the quality of your platform and positions may be at least a somewhat moot point. IMO, they would not be totally wasted: They can influence the national conversation, aspirations of voters, etc. I believe that Sanders' 2016 positions did that. But, a great platform and great positions plus "electability" should be a dynamite trifecta, no?