Blinking is also associated with psychological pressure, especially from lying. Come to think of it, John Edwards blinked even more in the TV debate with Shotgun Dick. IMO, Pelosi's mind is long gone, if it ever were around in the first place.
Did you notice the expressions on Ted Kennedy's and Hillary's faces? Ted was so sour he looked like he was passing stones. Hillary looked psychotic, disgusted, indignant at the same time. She is going to get shafted by her own party, and she is smart enough to know it. It must hurt like hell. Hehehe.