The all purpose joke

FIrst off, someone emailed me this joke:

Heaven

A man died. As he stood in front of St. Peter at the Pearly Gates, he saw a huge wall of clocks behind him. He asked, "What are all those clocks?"

St. Peter answered, "Those are Lie Clocks. Everyone on Earth has a Lie Clock. Every time you lie, the hands on your clock will move."

"Oh," said the man, "Whose clock is that?"

"That's Mother Teresa's. The hands have never
moved. She never told a lie."

"Incredible!" said the man. "And whose clock is
that one?"

St. Peter responded, "That's Abraham Lincoln's
clock. The hands have moved twenty times.
Abe told only twenty lies in his
entire life."

"Where's George Bush's clock?" asked the man.

"George's clock is in Jesus' office. He's using
it as a ceiling fan."

I was very amused. But somehow I thought I'd heard it before, so I googled it. This joke has been around. At first it seemed like it was originally a Republican joke that had been used against Clinton and Kerry and had recently been repurposed for Bush and Tony Blair. But a little more research found it had also been used for Jean Chretien (Canada PM), Jacob Zuma of the ANC, Gloria Macapagal Arroyo (Philippine President, O.J. Simpson, Paul Martin (another Canada PM), "Shrub" (apparently a republican politician) and someone named DJ that appears to just be a member of a forum someone else wanted to dis.

I'm just curious as to where this joke came from. The earliest posting on the Internet makes it an O.J. Simpson joke, although it could well have been taken from a standup routine referring to someone else entirely.

Well, I find it interesting, anyway.