Quarterly reports show CNN ratings hit a 21-year low, says the Hollywood Reporter.

Their current prime time lineup of Anderson Cooper 360 and Piers Morgan are both down in total viewers and adults 25-54 from previous quarters.

Daily ratings of 319,000 average total viewers has the network trailing big time behind MSNBC (689,000) and FOX News (1.79 million), both of which are also down in primetime.

What do you think is causing CNN's ratings drop?