So, smart moms in two homeschool social-media groups of which I’m a member are super-excited about Hillsdale College’s free “Constitution 101” course. “Hillsdale’s conservative, so it must be teaching Christian-centered history,” they say. “Hillsdale doesn’t accept grants from the federal government or participate in federal financial-aid or student-loan programs. How principled,” they opine. “Rush Limbaugh …