That proverb, that was coined by English writer, John Heywood, in 1546, uncannily refers to today's Democrat Party. I'm sure that the Democrats realize that they have bought a “pig in a poke” in their supposedly “elected” president, Joe Biden, but they don't want to admit it.
It is quite obvious, that in the Democrats' desire to get rid of Donald Trump, they brought all their political might (the news media, Hollywood, academia, Silicon Valley and social media etc.) to push Joe Biden over the finish line to have him become president. The way it looks now, the Democrats might just rue the day they chose a cognitively challenged candidate to be the one to take down Trump from being re-elected. It's only been 10 months since Biden took office, but it has been one disaster after another that has befallen his administration, with no end in sight.