The biggest news from Elizabeth Warren’s rally in Oakland, California, on Friday wasn’t what she said.  It was who introduced her and what that says about Warren and her 2020 Presidential campaign.  According to the San Francisco Chronicle, “Warren was introduced by Sonya Mehta, a former Oakland schoolteacher.”  However, this characterization is inaccurate.  Mehta was not an authentic public school teacher. She taught in a non-union charter school called “Learning Without Limits.” She also was a policy fellow at…