Piers Morgan had a not-so-good night on Tuesday. The CNN host drew his lowest-ever ratings in the all-important A25-54 demo. Just 77,000 people in the category tuned into his show, which was a pre-taped program focusing on the first anniversary of the B.P. oil spill, leaving Morgan fourth in his time slot, behind “Dr. Drew” on HLN, Rachel Maddow and Sean Hannity. The demo ratings were a steep drop from Morgan’s previous low of 108,000. The total viewers for the show were also at a record low: 354,000.