Robert E. "Robby" Mook (b. Sharon, Vermont, on December 3, 1979) is an establishment campaign strategist and campaign manager. Mook worked on many state campaigns before he worked for the 2004 presidential campaign of Howard Dean. He has also worked for Hillary Clinton.
Mook was hired to manage Jeanne Shaheen's 2008 New Hampshire senate campaign, which she won. In 2012, he served as executive director of the Democratic Congressional Campaign Committee.  In 2013, he managed Terry McAuliffe's winning gubernatorial campaign in Virginia.
Work for Hillary Clinton
In 2008, Mook joined the Hillary Clinton 2008 presidential campaign, which engaged in controversial tactics. He was the campaign's state director for Nevada, Indiana and Ohio. Clinton carried those three states, but Obama gained one more delegate than Clinton in Ohio.
Mook was chosen to be the manager for Hillary Clinton's 2016 presidential campaign. He was the first admittedly homosexual person to serve in such a role for a major presidential campaign. Many issues surrounded the Clinton campaign, and he struggled to manage them. Some of these issues include the Hillary Clinton email scandal and her questionable foreign policy record. According to the Washington Post, Mook received much praise from "both inside the campaign and among Clinton’s vast circle of second-guessers, for the airtight and drama-free campaign he has built."  This was during the 2016 Democratic Presidential primary.
On Meet the Press, Mook when asked about Hiliary Clinton's comments about Donald Trump's supporters being deplorable said, “Um, I think a lot of the people that stand behind Donald Trump are deplorable,” he continued. “And the things that they say are deplorable.” 
Mook is a registered Democrat.
- (December 6, 2010) "Robby Mook has been named executive director of the Democratic Congressional Campaign Committee, DCCC Chairman Steve Israel announced today."
- "Robby Mook Just Took The Hardest Job in Politics: Saving the Clintons From Themselves", Mother Jones. Retrieved on December 28, 2016.
- (Febuary 19, 2016) "both inside the campaign and among Clinton’s vast circle of second-guessers, for the airtight and drama-free campaign he has built.”
- (October 2, 2016) "Um, I think a lot of the people that stand behind Donald Trump are deplorable,” he continued. “And the things that they say are deplorable.”