President Obama mocked Mitt Romney on Sunday night for shifting his positions in the first nationally televised debate, saying his foe is not offering “change,” but a “relapse” to failed GOP policies. But Obama also acknowledged the poor reviews of his own showing.

As he took the stage at the Nokia Theater in downtown Los Angeles after a star-studded “30 Days to Victory” concert, the president praised the performers who entertained a crowd of 6,000, with a  nod to the “old-school” Earth Wind and Fire, and the “new-school” Katy Perry.