Prior to the driver's license question she was asked if she would pledge to keep Iran from going nuclear. She refused to give a straight answer to that one too. She said she'd "do everything I could to keep Iran from going nuclear," Russert said "but will you pledge?" She looked pissed but said, "I will pledge to do everything I can to keep Iran from going nuclear." Russert said, "But it may." She then degenerated into accusing Russert of "gotcha" questions because he wouldn't take crap for ice cream.
Yes, I would say Clinton has shown her vulnerability and it is a soft pale underbelly of incompetence under pressure.