RIP old cowboy: Don Imus signed off for good yesterday. Love him or hate him he was pure Americana, a man who pulled himself up by his own bootstraps more than once. He fought and lost many battles with his twin demons vodka and cocaine before finally cleaning up. He was an equal opportunity offender and despite the fact that President Clinton was a regular call-in to his show, he took the opportunity of the 1996 annual White House Correspondence Dinner to make fun of Bubba’s womanizing - before the Monica shoe had ever dropped - and called him “a...