Sally Kohn: You say in all your books that nothing can be won if the workers themselves are not taking action. The number that always comes up in your books and whenever you open your mouth is 90%. And you're crazy enough to believe that you can get 90% of people to be participating in something like a strike, she says. Kohn: I'm actually by laying it out to the workers from day one in every campaign. So building the kind of power required to get to 90% or north of 95% isn't something that you're going to hand to someone who's never tried to do it.