From eggman:
FOX BUSH SPEECH 4.3 [RATING] O'REILLY
2.7
HANNITY/COLMES 2.5
GRETA 1.5
SHEP 1.5
CNN BUSH 1.3
LARRY KING 1.3
AARON BROWN 0.8
MSNBC BUSH 0.6
OLBERMANN 0.6
HARDBALL 0.4
SCARBOROUGH 0.3
So, Donahue gets a 1.5 and he gets fired. Chris Matthews gets a .4 and he keeps his job. The important point to make here is that these ratings declines came after Donahue was sacked - not only was his show more popular than the others, he also likely brought in additional sticky eyeballs to the network.
I'm no big fan of Donahue - he isn't my top choice for the only liberal host on television (though I do think his show probably would have been a lot better had he had more freedom to do it his way), but this is just ridiculous.