SEATTLE — The leading proponent of a $15 an hour minimum wage in Seattle was challenged face-to-face today. Kshama Sawant engaged with small businesses owners worried about their survival. The impromptu meeting came after a City Council briefing on the implications of raising the minimum wage 63 percent, from $9.32 an hour to $15. “Despite all the rhetoric I'd like to understand the facts of what these other cities do and how they define the various terms that they use in the minimum wage ordinances,” said Council President Tim Burgess at the briefing. “My argument here is there's just not...