PHILADELPHIA—Alaska Gov. Sarah Palin takes her cheesesteak with Cheese Whiz and onions. The Republican vice presidential candidate made a brief campaign stop at Tony Luke's steak shop in South Philadelphia on Saturday evening. Wearing jeans and a beige raincoat, Palin greeted curious onlookers, signed autographs and posed for pictures before ordering two steaks to go. "Sarah, your steak is ready," a cashier said over the loudspeaker a few minutes after she ordered. As dozens of onlookers crowded around her, Palin headed back to the window to pick up the order. The cashier told her the order was on the house,...