Hillary Clinton was booed on Thursday evening when in a public appearance she said Bernie Sanders was not really a Democrat until the 2016 presidential campaign. While the crowd booed Mrs. Clinton insisted “You know it's true.”

In fact it is true. In an older interview he called the Democratic Party “Ideologically bankrupt” and as a Senator of Vermont he was known as “an independent” and self-described “democratic socialist.”

Sanders is no longer the underdog

Democrat or not, the race f...