Birth-control pioneer Margaret Sanger embraced some truly horrific ideas. But she also did quite a lot of good. Senator Ted Cruz has become the first GOP presidential candidate to formally sign on to the efforts by a group of black pastors to get a bust of Planned Parenthood founder Margaret Sanger removed from an exhibit at the Smithsonian’s National Portrait Gallery. The participants, who held a press conference Thursday, claim that Sanger’s appearance in the exhibit, called, “Struggle for Justice,” is offensive, because it places the reproductive rights trailblazer in a position of honor alongside such icons as Dr. Martin...