Hillary Clinton's Campaign manager, Robby Mook

We really don't hear much about Hillary Clinton's Campaign manager, Robby Mook. He seems content to manage from the background. I have noticed that when she is speaking to reporters on her new plane, Mook is glued to her side. I found that bizarre. So, I did some checking. Mook hails from Vermont, Bernie Sander's home turf. He was involved in several high profile Democratic campaigns, Martin O'Malley, Jean Sheehen, and Terry McCauliffe to name a few. When Clinton became Secretary of State, Mook circulated a "do not hire" list to Clinton's key people. He has been a major player in her current campaign. Mook, avoids the spotlight and appears to have his candidate following the same play book. By all accounts, Mook is untraditional, uncluttered, and much respected. It looks like Hillary's campaign style and availability are the results of Mook's guidance. To understand this election as it pertains to Hillary Rodham Clinton, you must learn about Robbie Mook.