AGAIN?…. For weeks, the McCain campaign, after a non-existent vetting process, insisted that Sarah Palin opposed the infamous Bridge to Nowhere project. They were wrong; Palin supported it. After being told of the truth, McCain kept repeating the line anyway, brazenly, as if he were so proud of his lie, he just couldn’t let go of it.

In time, enough people had heard the truth that McCain’s lie started to have diminishing returns. He boasted on CNN that Palin opposed the notorious bridge project on Sept. 16, and didn’t say it again.

That is, until today.

Campaigning in Wisconsin alongside Palin, McCain, complaining about earmarks, said, “[W]e’ve had a Bridge to Nowhere, $233 million bridge in Alaska, which I’m glad, happy to say, this governor stood up against.”

Now, every reporter on hand knew he was lying. I suspect even most of the crowd knew he was lying. Palin knew it, McCain knew it, practically everyone knew it. The line was debunked, over and over again, more than a month ago.

This, of course, leads to a few questions. Why on earth would McCain bring back a demonstrably ridiculous claim now? Does he not remember last month? Is there really something wrong with his cognitive skills?

Inquiring minds want to know.

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Steve Benen

Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.