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The "audacity of hope!" is a reference to Barack Obama’s keynote speech at the 2004 Democratic National Convention, “Hope in the face of difficulty, hope in the face of uncertainty, the audacity of hope..." Given a few months after Obama won the Democratic Primary for United States Senate, the speech received rave reviews. It put in him on the map for the US Senatorial race, which he ended up winning in November 2004.
Barack Obama / The Audacity of Hope! (n.d.). Retrieved July 25, 2019, from https://www.legacyamericana.com/Barack-Obama-The-Audacity-of-Hope_p_1159...
Scheiber, N. (2004, May 31). Race Against History. Retrieved July 25, 2019, from https://newrepublic.com/article/67604/race-against-history-0