By BY JONATHAN MARTIN AND SYDNEY EMBER U.S. https://ift.tt/370lc01 The dispute has led to negative attacks and doubts about party unity, exactly what Democratic leaders do not want to happen, for fear of handing an advantage to President Trump. New York Times Presidential Election of 2020, Presidential Election of 2016, United States Politics and Government, Debates (Political), Women and Girls, Primaries and Caucuses January 17, 2020 at 01:08AM