The resisting superdelegates’ odds of success are long. The proposal has the support of DNC Chairman Tom Perez and two former DNC chairs — former Vermont Gov. Howard Dean and Virginia Sen. Tim Kaine, Hillary Clinton’s 2016 running mate. And the DNC’s Rules and Bylaws Committee, following months of discussion, voted without dissent on Wednesday to recommend the plan to full DNC. The proposal was backed by many Clinton supporters, as well.