Not an actual picture of marketing guru David Leibowitz.We're not suggesting he's off to a galaxy far, far away or anything, but we can report that David Leibowitz is on the move.Leibowitz, a former Arizona Republic columnist and KTAR talk show host, has limited his journalism lately to freelancing. His main gig has been serving as the vice president/ creative director at the oh-so-cool downtown ad agency Moses Anshell. (And yes, when we write "oh-so-cool," we really mean, "this freakin' c