If I get a blank stare I say “bicameral legislature”, and most intelligent people are able to infer the meaning based on context.
If I still get a blank stare I offer the final lifeline of “two chamber”. The actual word “bicameral” doesn’t really matter.
If I still get nothing other than a babbling reply, I just change the subject to how nice the weather is.
As someone who used to be a registered republican, and is now registered independent, I’m confident when I say the ignorance is more heavily concentrated on one side.