A Common Phenomenon

Last year, I mentioned:

The experiment might be an example of a common phenomenon: Leftists attempting to devise an objective test that they imagine will prove conservatives are scum. This is then followed by dropping it when the test gives answers they don't like.

More recently, social scientists have been looking for the Magic Test that proves all open-minded people agree with the Left. They have one (science curiosity) but it's easily criticized so they're looking for more … with a certain lack of success.

On the other hand, maybe conservatives have taken enough of those tests to be able to fake open mindedness. On the gripping hand, how would we tell if liberals are faking?