Over the weekend Oprah Winfrey openly endorsed and campaigned for Barack Obama. Before then Mike Huckabee's surging campaign received help from Chuck Norris. Do endorsements make a difference? The video above attempts to answer that question.
Whatever the answer to that question, Huckabee is surging in the Republican race - he is now only 4.2% behind Rudy Giuliani in RealClearPolitics' national tracking of the crowded GOP field. His support has more or less doubled in just a month. Governor Huckabee is now well ahead in Iowa. He also leads in South Carolina. And is picking up reasonable support in the Giuliani stronghold of Florida.
The 'Oprah effect' on the Democrat race is yet to be properly tested but Hillary's national lead remains formidable. Her difficulties are in the early states - notably Iowa, where Senator Obama has moved into a narrow lead.