From "The lying game":
McCain's propensity to lie has become what political junkies call a meme, an idea or behavior that runs, seemingly unstoppably, from one media outlet to another. Some bloggers offer daily counts of how many falsehoods McCain tells while others wonder why the Democrats do not respond in turn. Even the mainstream press has gotten into the act. One of the pleasures of the 2008 campaign -- I admit they have been few and far between -- is watching all those who once admired John McCain for his truthfulness realize the true depths of his moral depravity. When McCain is linked to Palin, moreover, as he so frequently wants to be, lying experiences something of a multiplier effect. These candidates lie so much that they have taken to lying about their own lies.
Before we get carried away with enthusiasm about all this, though, we should keep two things in mind. One is that we are so quick to label McCain a liar that we tend to forget how much, and with what horrendous consequences, George W. Bush possessed the same character flaw. The other is that Republicans lie so frequently, not because the party just happened to settle upon one serial liar after another to run for high office, but because the form of conservatism to which they all adhere demands that if they are to win they have no choice but to lie.
[My emphasis added.]