(RTTNews) - Mary J. Blige performed at Thursday night's Democratic national convention. She performed a cover of U2's classic track "One." She followed this up with her own hit "Family Affair," leading into the song by asking the crowd to "get it crunk for President Obama!" "One" is featured on U2's album Achtung Baby. "Family Affair" appears on Blige's fifth studio effort, No More Drama. Thursday was the final night of the Democratic convention. It closed with President Barack Obama accepting the nomination for another term in the White House. He will face off against Republican nominee Mitt Romney in November.