Written by DCist contributor Christopher Durocher Fresh from his underwhelming appearance on Oprah, former New Jersey governor and “proud, gay American” James McGreevey will speak and sign copies of his new memoir, The Confession, at Books-a-Million in Dupont Circle tonight. The Confession chronicles McGreevey’s rise to national prominence as one of the country’s most powerful governors and his dramatic fall after admitting to an extra-marital affair and attempts to make his lover (or object of…