The US Democratic primaries seem to be yo-yoing up and down. No that long ago when Obama was underdog Oprah Winfrey came out for him. Now the head of the Black Entertainer’s Alliance has nailed his colours (or should that be “colors”?) to the Clinton mast and is making veiled drug references . After a “Dewey Wins” moment in New Hampshire last week Obama is underdog again. Two down , 48 to go I guess.