"We are guided by Hillary's bedrock values of hard work, service, fairness and faith in the American Dream," the memo states.
On Saturday, Mook summoned the team of volunteer aides who will assume staff jobs once the campaign launches to Clinton's new headquarters in Brooklyn, N.Y., for an all-staff meeting to outline the organization's "purpose and values," according to a Democratic operative who was present but requested anonymity to describe the internal meeting.
The memo was first reported by Politico, and a copy was obtained by The Washington Post.
The document states the campaign's goal in simple terms, underscoring the Mook team's focus on data: "For Hillary Clinton to earn a winning number of delegates to secure the Democratic nomination and win 270 electoral votes to become the 45th President of the United States."
The memo goes on to list eight "guiding principles" of the Clinton campaign, including diversity, discipline and humility. The principles seem designed to help the Clinton team avoid the infighting, dysfunction and arrogance that plagued her 2008 campaign.
"We are humble," Mook writes. "We take nothing for granted, we are never afraid to lose, we always out-compete and fight for every vote we can win. We know this campaign will be won on the ground, in states."
In another passage, Mook writes, "We are disciplined: driven every day by strategy, not tactics or one offs. We know there will be tough days, but we will bounce back and get back to work. We take risks, always measuring with empirical data to establish best practices."
It was Mook's idea to draft a values document, but it includes input from several Clinton advisers, including Joel Benenson, her chief strategist and pollster for President Obama's campaigns; Roy Spence, a creative media strategist; and Huma Abedin, Clinton's longtime aide and confidante.