Two candidates aiming to become San Francisco’s next mayor are teaming up. KCBS Radio, KPIX 5 and Chronicle Insider Phil Matier talks about the deal that Supervisor Jane Kim and former State Senator Mark Leno have made, in which they’re asking their supporters to mark them down as their first two choices under the city’s ranked choice voting system, and what’s behind this unusual move. He also talks about how this maneuver is affecting the overall tenor of the mayoral race.