Thursday, August 28, 2008 :The Democratic Party is preparing to pay tribute to Dr. Martin Luther King today ahead of Barack Obama's nomination speech. While Obama is expected to reference King's speech tonight, one of his longtime supporters is urging him to also draw on the political rhetoric of African American women, including Fannie Lou Hamer, Ella Baker, Barbara Jordan and Shirley Chisholm. We speak with Melissa Harris-Lacewell.