This one was spotted in a New York Times article, covering the Presidential race in Minnesota and Wisconsin. Here is the context and quote:
Chris Rutherford, 51, of Minneapolis, is leaning back in Mr. Trump’s direction as a result of recent unrest. A Republican who said he was dismayed by Mr. Trump’s “constant lying,” Mr. Rutherford said he had been deeply troubled by the damage to his community inflicted first by the coronavirus pandemic and then by episodes of vandalism and rioting.
“Covid is wiping out these businesses and this was the nail in the coffin,” Mr. Rutherford said, stressing, “We cannot have these riots.”
Mr. Rutherford said that while he slightly favored Mr. Trump, he might still support Mr. Biden if he did more to warn of repercussions for people who “grotesquely violate the law.”
“He says, ‘I condemn,’ but he doesn’t ever say what he’s going to do,” Mr. Rutherford said, adding that if Mr. Biden went further it would be “the straw that would tip me over to him.”
This is a mashup of “the straw that broke the camel’s back”, “the last straw”, (both meaning the final problem in a series that causes one to finally lose one’s patience) and “tip the scales (or balance)” (something that upsets the balance such that one side gains advantage). It’s almost a congruent conflation, as all the expressions refer to an incident or something that finally changes the situation. As the contributor points out, “straws” seem to pop up in malaphors frequently. Past examples include “it was the nail that broke the camel’s back”, https://malaphors.com/2016/04/06/it-was-the-nail-that-broke-the-camels-back/, “the last straw in the coffin”, https://malaphors.com/2012/11/22/the-last-straw-in-the-coffin/, “I’m at the end of my straw”, https://malaphors.com/2013/04/12/im-at-the-end-of-the-straw/, and “that’s a bit of a straw horse”, https://malaphors.com/2019/04/29/thats-a-bit-of-a-straw-horse-isnt-it/. Even one of my all time favorites, “let’s draw hats”, has the ubiquitous straw floating in the speaker’s mind. A big thank you to Barry Eigen for noticing this one and sending it in.
Still thinking about buying the latest malaphor book, “Things Are Not Rosy-Dory: Malaphors From Politicians and Pundits”? This latest malaphor might be the straw that tips you over. Check it out on Amazon: https://www.amazon.com/dp/B08C7GGMG5?ref_=pe_3052080_397514860