President Obama is going to start getting requests at press conferences. Obama sang “Sweet Home Chicago” at a White House event last night. At first he seemed reluctant, but when blues legends B.B. King and Buddy Guy asked, the president obliged. “Come on!” said Obama when Guy asked. “You done started something. You gotta keep it up now,” said Guy. Last month Obama sang a bit of Al Green’s “Let’s Stay Together” at a fundraiser.