The future of dramatic school reform begun by D.C. Public Schools Chancellor Michelle Rhee could be in jeopardy, not from the teachers union or the city council members with whom she has tangled, but because of past personal relations.

Already embroiled in fierce local battles over a recent round of teacher firings, Rhee is now facing allegations that she helped cover up charges of sexual misconduct against her now-fiancé Kevin Johnson, mayor of Sacramento, Calif.