It’s been a challenging week in the ratings for just about any network not named NBC, but for CNN, last week was especially rough in the ratings department as the network experienced another 20-year low in primetime. Between 8-11pmET CNN averaged 307,000 Total Viewers / 86,000 A25-54 viewers.

At 9pmET, “Piers Morgan Tonight” drew 314,000 viewers with 81,000 in the demographic. The “Anderson Cooper 360″ re-air drew 259,000 Total Viewers and 97,000 A25-54 viewers at 10pmET. The ratings for Morgan’s program and the 10pmET edition of Cooper’s program marked 20-year lows for the network in their respective time slots.

Just last week, on an earnings call, Time Warner CEO Jeff Bewkes acknowledged the networks’ struggles saying “fixing” CNN was a top priority.

We’ll have the full cable ranker from last week later today.