HARRISBURG, Pa. (AP) — Dr. Mehmet Oz, the celebrity heart surgeon best known as the host of TV’s Dr. Oz Show after rocketing to fame on Oprah Winfrey's show, is planning to run for Pennsylvania’s open U.S. Senate seat as a Republican, according to three people familiar with his plans. Should Oz run, he would bring his unrivaled name recognition and wealth to a wide-open race that is expected to among the nation’s most competitive and could...