CNN history HIGHEST RATED EVENT IN CNN HISTORY... "23 million watched GOP debate, a record for CNN" HIGHEST RATED EVENT IN CNN HISTORY... HIGHEST RATED EVENT IN CNN HISTORY HIGHEST RATED EVENT IN CNN HISTORY HIGHEST RATED EVENT IN CNN HISTORY CNN HIGHEST RATED EVENT IN CNN HISTORY... HIGHEST RATED EVENT IN CNN HISTORY... "23 million watched GOP debate, a record for CNN" HIGHEST RATED EVENT IN CNN HISTORY