Amidst political polarization, public policy mediators help disputing parties contribute their wisdom and experiences to resolve their complex public conflicts. Mediators trigger and sustain civic fusion, a phenomenon in which people with passionately different political positions bond to address common public goals without sacrificing their core values. Civic Fusion analyzes how policy mediators carefully design and implement processes to guide representative negotiators to resolve deep disagreements when the status quo is unsustainable, no party can effectively act unilaterally, and all are frustratingly stuck in place.