CBS can claim anything it likes. The American people have a way of knowing what political bias looks like, and CBS stands out.NBC is right up there at the top too.
CBS could have avoided much of this fiasco had it merely presented the story in a balanced fashion --and conceded immediately that the memos were forgeries.
After the fact, we learned that CBS was in posession of mountains of evidence wich disputed the implications made in the forged documents. Information they gleaned from interviews with Killian's family members and other guardsmen was ignored in their account. CBS also knew that Bush HAD volunteered to be considered for overseas service, but was not needed. They did not air one bit of that evidence to balance their allegations against Bush.
There are two sides to bias -- the side you show and the side you ignore.
If it looks currupt, if it smells corrupt, then it probably is corrupt!