After delivering a powerful eulogy that both memorialized Rev. Clementa Pinckney and called for the removal of the Confederate flag, President Obama lead the congregation in the singing of Amazing Grace. See the emotional video above. http://newsone.com/3133979/watch-president-obama-to-deliver-eulogy-at-funeral-for-charleston-ame-victim-s-c-sen-clementa-pinckney/?omcamp=sf_N1TW