His latest mayoral bid may be over, but Thiru Vignarajah is not going away quietly. This week, the Baltimore City Board of Elections cleared Vignarajah to begin collecting signatures on a petition for a ballot question that could undermine the current plan to redevelop Harborplace. The question, which was reviewed by the board’s attorney for legal sufficiency, would ask voters to establish under the city’s charter a system of city parks dedicated in perpetuity in hopes of protecting them from “certain private, commercial development.”