Multiplatinum artist Kid Rock slammed television icon Oprah Winfrey on Saturday and called her a “fraud” after Winfrey endorsed the Pennsylvania Senate campaign of Democrat John Fetterman over his Republican opponent, Dr. Mehmet Oz, whom Winfrey has known and worked with for decades. “Oprah helped Dr. Oz with his career,” Kid Rock tweeted Saturday in a post that was retweeted over 10,000 times. “I assume because she vetted him and found him to be a wonderful person. Now she is against him. Oprah is a fraud. -Kid Rock.” Winfrey, a Democrat, announced on Thursday that she is supporting Fetterman’s Senate...