CNN’s Anderson Cooper cracked up with his guests on Thursday as he and a former Bill Clinton advisor deliberately flubbed each other’s names, a gentle and topical ribbing of Joe Biden in light of the president’s latest gaffes. Appearing on AC360, Cooper asked political consultant and commentator Paul Begala his thoughts on Biden’s remarks to a live audience in a question-and-answer session. Begala said he found Biden to be heavy on substance, but light on style. Want more breaking political news? Click for the latest headlines at Raw Story. “I saw substantive mastery,” said Begala. “I mean my …