TOWN OF JOHNSTOWN — Fulton County's largest town will get a new supervisor this year. With no primary challenger declared in GOP-favored territory, Christina VanValkenburgh, 44, presently walks an auspicious path to succeed outgoing Johnstown Town Supervisor Jack Wilson. "Jack's done a wonderful job," said Republican VanValkenburgh. “But I think it's time for some younger people to step up.” VanValkenburgh began climbing the local political ladder two years ago when she was appointed to fill a Town Board vacancy and, within less than six months, the deputy supervisorship. Wilson critic and longest currently serving town lawmaker Timothy Rizzo voted against…