Marlon Marshall, key White House aide, steps down Friday

The two men worked together on Clinton's 2008 presidential campaign and Marshall stayed with Clinton until she conceded the Democratic primary, before joining Obama's general-election campaign. Mook and Marshall maintain an informal network of political operatives dubbed the " Mook Mafia "; a slew of internal e-mails were leaked from the group's communications in November, underscoring the intense jockeying among Democrats in the run-up to the 2016 campaign.

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