In the midst of the election, Kmiec proceeded to write "Can A Catholic Support Him?: Asking the Big Question About Barack Obama" (2008) to explain his support for Senator Obama in light of Catholic principles. The book's introduction was written by "West Wing" actor Martin Sheen. Sheen and Kmiec did a series of radio and video commentaries for the Matthew 25 network in support of Obama. Kmiec also campaigned for the candidate as part of his "Faith, Family and Values Tour".