Preliminary ratings for last night's debate on the Fox Business Network show that 13.5 million people watched, down slightly from the 14 million who watched the CNBC debate. 1.4 million people live streamed the debate on Fox Business' website.
Fox Business is less carried on cable than CNBC, sometimes included in a more expensive tier, but I think Fox Business was giving free previews of the channel on many cable and satellite systems. That doesn't mean people who usually don't get the channel even knew where to watch.