I'm not sure "ability to bluff" is the characteristic I want to select for in my politicians. I'd select for a lack of ability to bluff, but then they would just try to fake that...

Luck seems as good a way as any. Or math problems? I'd love a test of science, but the makeup of that test might be too political and I don't want bible trivia on the next one.

First to shuck 50 oysters would fit local flavor.