Who makes the final decision on this?
[On the weekend of February 24, 2017, those 447 or so members of the Democratic National Committee will meet and vote to determine its new leadership. According to the group’s charter, the chair (and eight other leadership officers) will be elected by “a majority vote.”]
http://www.vox.com/policy-and-politics/2016/11/23/13703720/dnc-chair-election-rules-members