Touching eulogy: The President of USA , Barack Obama

President Barack Obama delivered a touching eulogy, a rousing political speech and a thoughtful meditation on race in America when he traveled to Charleston, South Carolina on Friday to speak at the funeral of the Rev. Clementa Pinckney, who was gunned down last week by a racist terrorist during Bible study.

But the President's speech will be remembered for a moment at the end when he launched into a solo of "Amazing Grace," that at first stunned the mourners and then brought them to their feet as they joined him in song.

As a nation, out of this terrible tragedy, God has visited grace upon us for he has allowed us to see where we've been blind," Obama said. "He's given us the chance, where we've been lost, to find our best selves."

The President's remarks at times felt like a sermon, with organ chords backing him during some of the most impassioned passages. The mostly African-American crowd was, at the end of the eulogy, on its feet, clapping and cheering Obama as he named each victim of the church shooting and declaring each "had grace."

The President, first lady Michelle Obama, Vice President Joe Biden, a bipartisan host of high-level members of Congress and Hillary Clinton all attended the memorial service at TD Arena in downtown Charleston. Last Wednesday, a 21-year-old man opened fire at a Bible study inside Charleston's Emanuel African Methodist Episcopal Church, killing nine.

The shooter declared he was there to "kill black people," and an online manifesto attributed to him contained white supremacist screeds.

Obama, in his eulogy, said the killer likely assumed he "would deepen divisions that trace back to our nation's original sin."

"But God works in mysterious ways," Obama said. "God had different ideas. He didn't know he was being used by God."

"The alleged killer could have never anticipated the way the families of the fallen would respond when they saw him in court in the midst of unspeakable grief, with words of forgiveness," Obama said.