White House Chief of Staff: Hillary Clinton 'Would Be a Very Good President'

Denis McDonough praises Hillary Clinton's preparation and experience.

White House Chief of Staff Denis McDonough (C) talks with former national security advisors Tom Donilon (L) and Stephen Hadley before U.S. President Barack Obama announces his nomination of Ashton Carter to be the next Defense Secretary in the Roosevelt Room at the White House December 5, 2014 in Washington, DC. 

Photo by Chip Somodevilla/Getty Images

Another prominent Democrat has given Hillary Clinton the thumbs-up for 2016, and this one works at 1600 Pennsylvania Avenue.

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