PHILADELPHIA

It had to be the first time in history that a presidential candidate had a hip-hop moment.

Barack Obama, who says he listens to Jay-Z along with his “old school guy” favorites like Earth, Wind & Fire and the Temptations, alluded to the rapper’s 2003 hit “Dirt Off Your Shoulder” on Thursday to sweep away concerns about his pugnacity.

After conceding that the Philly debate was tough, he brushed the imaginary lint of Hillary, George and Charlie from his shoulders, in a wordless reference to Jay-Z’s lyrics in his anthem about not letting anyone crimp your ride as you cruise from the bottom to the top: “Got some, dirt on my shoulder, could you brush it off for me.”

There’s no doubt the cat is cool. It’s easy to imagine the wild reception many parts of the world would give a President Obama as he loped down the stairs of Air Force One in his aviator glasses, the chic and chiseled Michelle on his arm.