"A More Perfect Union" is the name of a speech delivered by Senator Barack Obama on March 18, 2008 in the course of the contest for the 2008 Democratic Party presidential nomination. Speaking before an audience at the National Constitution Center in Philadelphia, 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. Obama framed his response in terms of the broader issue of race in the United States. The speech's title was taken from the Preamble to the United States Constitution.