Media Bistro: Last night's Democratic debate on CNN drew 8,324,000 million total viewers, making it the most-watched primary debate in cable news history, and the second-most watched on TV this election cycle (ABC's Democratic debate on Jan. 5 drew 9,360,000)
The debate gives CNN the top five highest rated cable debates this cycle in total viewers.

> Update: In the A25-54 demo, the debate finished with 3,257,000 viewers, the #1 take in cable news history as well.