Question: In what capacity did the husband of the art curator and philanthropist based in Louisville Brooke Barzun serve for President Obama's 2012 re-election campaign?
Sentence (from "Brooke Barzun"): Brooke Barzun (born Brooke Lee Brown on June 18, 1972) is an art curator and philanthropist based in Louisville, Kentucky with her husband, Matthew Barzun, the former United States Ambassador to the United Kingdom.
Relevant evidence: Yes