Julian Zelizer : If they run in 2016 , Hillary Clinton and Joe Wilson need new leaders . Building on her experience in government , she is also looking for better ways to provide physical security by dealing with vulnerable infrastructure that national policymakers have not done enough to protect . He says a number of mayors and governors provide clues for new Democratic candidates . Zelizer says the focus from governors and mayors is on middle - class security . Zelizer supports Governor Bill de Blasio , Julian Castro and Sen . Andrew Cuomo , and O'Malley .
Julian Zelizer : If they run in 2016 , Hillary Clinton and Joe Wilson need new leaders . He says a number of mayors and governors provide clues for new Democratic candidates . Zelizer says the focus from governors and mayors is on middle - class security . Zelizer supports Governor Bill de Blasio , Julian Castro and Sen . Andrew Cuomo , and O'Malley .