WASHINGTON — If there’s a common buzzword in Democratic circles as Election Day nears, its authenticity. Think of it as a push to present candidates in a more open and unvarnished manner. Democrats have tried to field candidates with nontraditional backgrounds, military service and personal histories that appeal to voters who have tired of politics-as-usual. These attributes could provide an early look at what voters will demand as the 2020 presidential campaign draws closer. One of the widely accepted lessons from Democrat Hillary Clinton’s loss in 2016 to Republican Donald Trump was that voters gravitate toward candidates they perceive as real, even if flawed. They’re drawn to politicians willing to deliver unexpected candor. Trump’s fans often say they admire his candor and willingness to defy political conventions.