GEORGE Stephanopoulos should remember to shave. At Barack Obama’s big fund-raiser at the Grand Hyatt, an unshaven, short-sleeve shirt-clad Stephanopoulos was stopped from entering the press pen by an overaggressive Obama aide who demanded, “Do you have press credentials?” The ABC newsman and host of “This Week” obliged without protest, at which point the embarrassed aide apologized profusely and said, “I didn’t recognize you.”