The phrase "crackpot for" is grammatically correct and can be used in written English.
It is typically used to describe someone who is overly enthusiastic or obsessed with a particular topic or idea, often to the point of being eccentric or irrational. Example: "Joe is a total crackpot for conspiracy theories. He spends hours reading about them online and even attends rallies to spread his beliefs."
Said crackpots, for instance, would know that 20 and 13 add up to 33, which they "consider a 'highly charged master number,' full of meaning".
With apologies to Baez, here is The Crackpot Index for Media Content: A simple method for rating News and Opinion.
Desperate to know what all this mumbo jumbo was about (is it Sudoku? Satanism? Numerology? Crackpot refuge for a gambling addict?) I went looking for DePrince on the internet.
From the sleek, sexy flowing evening dress of white silk trimmed with gold braid that he designed for Ms. Hepburn in "The Philadelphia Story" (1940) to his lovably crackpot outfits for the Munchkins in "The Wizard of Oz" (1939), Adrian's movie concepts bore the mark of a designer who carefully thought everything through.
In 2006, El Paso County Attorney Bill Louis denounced Bruce as a "narcissist, sociopath and crackpot enabler" for supporting Colorado's Amendment 38, a referendum designed to ease rules for petitioning measures onto election ballots.
In one, Vance DeGeneres (yes, Ellen's brother) interviewed a chainsmoking elderly man who's a crackpot candidate for president this year.
It's been nearly 22 years since Tupac Shakur was murdered in Las Vegas, and for nearly 22 years there have been a lot of conspiracy theories and crackpot opinions like, for instance, that Tupac faked his death and is in fact still alive and living with Elvis in Mexico and discussion about who exactly is responsible.
In the aftermath of the terrorist attacks, audiences may be avoiding an opera about a delusional soldier in 1820's Leipzig who supplements his meager pay by performing menial tasks for an overbearing captain and offering himself as a subject for crackpot medical experiments.
