Speaking yesterday at a rally in honor of slain cop Omar Edwards — gunned down by a fellow cop in a case of mistaken identity — the embattled congressman outrageously quipped that President Obama, in town for a date with First Lady Michelle, should watch his back walking around the Big Apple because he is black.

“Make certain he doesn’t run around East Harlem unidentified,” the controversial lawmaker snarked.

“If [he] did not have the Secret Service . . . around him, [city cops] wouldn’t know if he was president of the United States.”