Primetime is difficult. It can be incredibly unforgiving -- especially in this season of high-def politics. The exposure associated with 300 plus million viewers watching every presidential miscue has never been greater. Yet, primetime is the venue that the venerable Obama chose when he turned hope and change into a 24/7 infomercial. That his ratings are slipping is beyond debate. How and when he reached his tipping point is the real cliffhanger. No, his fade is not about policy, and it's not about politics. It's not about economics and it's not about healthcare. It's about style. It's about how President Barack Obama jumped the shark in dmod denim. Shark jumping has its origin in an instant that happened 32 years ago this month. It was on an inauspicious autumn night when most of America had just finished dinner. Unsuspecting and innocent, families of all stripes were winding their day down, yearning for a little respite. They were looking for a break in the bluster of Cold War contentions and deleterious disco. They were hoping to get lost in primetime, in a better time -- in Happy Days . What they got instead was anything but happy. For, on the evening of September 20, of 1977, Arthur Fonzarelli ("the Fonz") traded his patented blue jeans for powder-blue swim trunks and water-skied an entire sitcom into television infamy. On that fateful day, the king of cool donned a crown of kitsch; Fonzie jumped over a shark, and Happy Days became sad. Before