With Fox ruling ratings roost, CNN looks ahead

What's the No. 1 brand in cable news? That depends, in part, on how many screens you're counting.

With the second-quarter drawing to a close, Fox News Channel is running up the score on the competition, posting its highest ratings ever and boasting of an evening audience equal to those of CNN, MSNBC and Headline News combined.

But that's only looking at TV. And that's something CNN -- which had its best second quarter since 2003 in total viewers, but fell to third place in primetime in the crucial 25-to-54 demographic -- says it's not doing anymore now that so much news is being consumed on computers and mobile devices.