Update (5:37 p.m. EST): Cain concludes the press conference after his explanation of the allegation by Kraushaar. Live feed is over, but Twitter storm continues.
Update (5:35 p.m. EST): "I can only recall one thing that I was aware of that is called sexual harassment... one day in my office at the National Restaurant Association, I was standing with Ms. Kraushaar and I gestured like this (brings his hand up to his chest), 'you're the same height as my wife. She comes up to about here.' " He says his lawyer says that's the gesture that infuriated Kraushaar."
Update (5:33 p.m. EST): Cain says there's a possibility he might remember Bialek, just as he said he forgot the settlement with Kraushaar. "But I happen to think it's a remote possibility ... I seriously doubt I'm going to have an 'aha' moment later."
Update (5:31 p.m. EST): CNBC's Carl Quintanella tweets: "At the airport, where the sound of Herman Cain discussing sexual harrassment is blaring over a gate full of 10 and 12-yr-olds."
Update (5:26 p.m. EST): Cain says the allegation by Karen Kraushaar, who went public on Tuesday was "baseless," which he supports by pointing out the National Restaurant Association made a settlement with her.