It seems to me, that Presidential Election fraud on a massive scale damages a great many people, corporations, institutions, political parties and campaign donors. I realize those aren't your standard legal arguments, but this is not a standard legal case. Use of the media on such a massive scale is tantamount to an attempt to overthrow the US Government with a band of "Jack Boot Thugs."
The voting public maybe indirectly affected by CBS's actions but damaging GWB, not us, was were not the intent of airing that report. GWB is the only party with direct, personal damage and even then, he has a hard case to make considering he's a public figure.
And yes, the CBS is expecting that GWB does the "new tone" thing so that they can "slime another day". Barring that, they will use the legal system and their MSM cohorts to protect themselves from the consequences of their political acts.