I just don't think that the average-Joe republican voter knows what Bilderberg is... All they hear is a name...
When I bring up Bilderberg and someone gives me the confused look I try my best to avoid the details... I just simply state "a lot of powerful people and leaders in the world (I mention some names) meet at a Hotel... I don't want my governor (now possible "president") influenced by these people and/or cutting deals with them."
It usually sparks an interesting discussion, and it leaves out the conspiracy element which usually gets rolled-eyes and gives you less credibility (to them)... It's presented as an honest concern...
Just say he works with the people that own the Federal Reserve Bank. Emphasize Bank as a Privately Owned Entity, hence why we pay interest on the money we borrow from it.
I agree though that Logical Arguments with stupid people dont get very far.