Your CBS affiliate has more pull with CBS than you do. Finally, follow up by filing a complaint with the FCC, naming your local affiliate as broadcasting material that is against the public interest, and request that the station's license be revoked.
my letter to cbs:
'HOW DARE you stick with that stupid story about Bush's Guard service, and how dare you continue to impugn the integrity of the President of the United States with such obvious propaganda. Stuff your stupid questions of the White House and make Dan Rather GO.
I am now calling up the sponsors AND the FCC. And a lawyer.'