Who has been defamed? Lets start with George Bush, then we move on to Jerry Killian. Well, he's dead, but I bet his widow and son have claims against CBS.
What are their damages? Unknow monetary value, but the whole idea behind libel and slander is damage to a man's reputation.
It's diabolical. GWB can't sue, it's political suicide (and a waste of money, plenty of small time liars out there saying worse, see Kitty Kelly).
Idle speculation on my part, but seriously wonder if Dan Rather and CBS have a legal leg to stand on. Terry McAuliffe said Bush was AWOL, no damages. Al Gore said GWD deserted the country. Many talking heads say GWB lied, about Iraq, about everything. Air America is legal. So what keeps CBS News from being the TV equivalent of Air America?