Post turtle is a phrase that has been used in political discussion of various countries, including the U.S. and Canada, based on an old joke. Various politicians have been referenced by the joke or used the joke, including Bill Clinton, George W Bush, Barack Obama, and Donald Trump. 
An old rancher is talking about politics with a young man from the city. He compares a politician to a "post turtle". The young man doesn't understand and asks him what a post turtle is.
The old man says, "When you're driving down a country road and you see a fence post with a turtle balanced on top, that's a post turtle. You know he didn't get up there by himself. He doesn't belong there; you wonder who put him there; he can't get anything done while he's up there; and you just want to help the poor, dumb thing down."
Mary Doria Russell used the post turtle reference in her 1996 novel The Sparrow, attributing it to Father D.W. Yarborough, leader of the first Earth expedition to another planet. Yarborough refers to post turtles in the context of seeming anomalies in nature and regards them as proof of the existence of God, specifically of God trying to get our attention.
The Natural: The Misunderstood Presidency of Bill Clinton by Joe Klein, published in 2002, quotes Clinton as saying: "If you see a turtle sitting on top of a fence post, it didn't get there by accident." According to Klein, this was Clinton's way of claiming partial responsibility for "the historic prosperity and the global peace that attended his time in office".
- Kennedy, William (March 24, 2002). "The Turtle on the Fence Post". The New York Times.
- "Political Jokes – Bush the Post Turtle". About.com. Retrieved November 1, 2013.
- Dorinson, Patrick (August 28, 2009). "The Cowboy Libertarian: Obama the 'Post Turtle'". Fox News – Opinion.
- "Donald Trump - The Post Trutle". October 2, 2018.
- Russell, Mary Doria (1996). The Sparrow. Villard.
- Ivins, Molly (2003). "Turtle on a Fence Post". Democrats.US. Archived from the original on July 7, 2004.
- Benen, Steve (October 9, 2008). "Eric Cantor, Post Turtle". Political Animal (Washington Monthly).
- "Lady Antebellum wins 2 CMA awards". The Augusta Chronicle. November 11, 2010.
- Further examples of the "post turtle" joke at The Big Apple.