Question: "A More Perfect Union" is the name of a speech delivered by then Senator and future President Barack Obama on which date, Obama was responding to a spike in the attention paid to controversial remarks made by the Reverend Jeremiah Wright, his former pastor and, until shortly before the speech, a participant in his campaign?
{'answer': 'March 18, 2008', 'supporting_facts': [['A More Perfect Union (speech)', 0], ['Jeremiah Wright', 0]]}