Did Mitt Romney miss his “Sister Souljah moment’’? The debate erupted recently when Rush Limbaugh called a Georgetown Law student, who spoke in favor of Obama’s contraception policy, a “slut’’ and a “prostitute.’’ Romney’s response struck some inside and outside his party as woefully inadequate. Recent history shows presidential candidates face peril and promise when they choose either to confront or ignore the most inflammatory voices within their party. Bill Clinton, in the 1992 presidential campaign, denounced the rapper Sister Souljah for her remarks after the LA riots.