Wish I'd heard it. To me Vince Cable is not a serial liar though. When so many people's pensions and savings were decimated by Brown's lies of ending boom and bust, back then Cable was the only politician I know who was trying to warn us all of what was about to happen.
I think he like all politicians gets trapped in the idealism of the party they signs up to. The minute they do, especially if by surprise, as in Cable's case you suddenly find yourself in government, the risks of appearing two-faced, particularly to your long-term supporters increases.
I sometimes think a coalition is a better form of government because it cannot help but reduce the effect of knee-jerk doctrinaire idealistic thinking on the decisions the government eventually makes.