Here’s a powerful piece about how an award-winning principal went from being a Common Core [1]supporter to an opponent, says the Washington Post. This was written by Carol Burris, principal of South Side High School in New York. She was named the 2010 New York State Outstanding Educator by the School Administrators Association of New York State. She is one of the co-authors of the principals’ letter [2]against evaluating teachers by student test scores, which has been signed by 1,535 New York principals…