That's a Steinbeck quote[1]. It's surely being used, just as it was originally, as a fun way to describe the somewhat banal point that people in demographics relevant to organized labor often hold opinions about public policy that are contrary to their personal interest. It's not a literal statement about what's in a republican voter's head.

That said: how many posters here consider themselves just One Great Idea away from being the next Zuckerberg, and thus tend to view discussions on, I dunno, work/life balance or engineers' unions from an employer's perspective instead of their own? Seems like more than a few to me.

[1] OK, I checked wikipedia, turns out that the original phrase was "temporarily embarrassed capitalists", but this is the variant that stuck.