(RECAP: Using its power of the purse, Congress can stop what might be the most disturbing social-engineering project ever undertaken by the federal government. Will it? Last week, House Republicans pushed through an amendment to a HUD spending bill that defunds enforcement of the agency’s new “Affirmatively Furthering Fair Housing” rule. The Orwellian-sounding regulation, set for final OK in October, would force some 1,200 municipalities to redraw zoning maps to racially diversify suburban neighborhoods.)