Bedtime Question: Do Liberals Lie on Purpose?

I've been reflecting on this tonight. Do liberals lie on purpose? Some liberals I know are such moral relativists that by dinner they've changed the position they held at breakfast. A liberal will claim to believe in individual rights, and argue two minutes later against the rights of individuals with whom he happens to disagree. Actually, I have some relatives like that. You have a conversation and the very next day have another that is completely at odds with the first. So do liberals lie? Or are they so "broad minded" that they can actually hold numerous contrary opinions all at the same time?

Now that I think about it isn't that a sign of mental illness? Maybe liberals aren't liars, they're certifiable. What do you think?