David Richter, the Republican millionaire ex-businessman who wants to take Democrat incumbent Andy Kim’s seat in the U.S. House of Representatives representing New Jersey’s 3rd Congressional District, may have to continue moving north if he hopes to earn even a GOP nomination in June.

Richter originally was in the running, and even considered the early favorite, for the GOP nod in New Jersey’s 2nd District, which includes all or parts of Atlantic, Burlington, Camden, Cape May, Cumberland,…