Newly minted Super Bowl MVP Eli Manning yukked it up on David Letterman last night, days after the Giants won the NFL championship against the Patriots in a historic upset. Manning took a shot at the Pats’ coach, Bill Belichick, on the “Late Show,” zinging him for leaving the field before the game was officially over. “Trying to beat traffic, I guess,” Manning said to the audience’s delight. “Must have been murder that day in Arizona,” Letterman added. But Manning ...