Implicit mustachism on the 2008 ANES
The American National Election Studies 2008 Time Series Study included an Affect Misattribution Procedure (AMP) that measured implicit attitudes. The 2008 ANES User's Guide, located here, noted that, "[d]uring this module, respondents attributed a 'pleasant' or 'unpleasant' characteristic to Chinese-character graphic images, each of which was displayed to the respondent following a briefly flashed photo image of a young male."
Here are the photos of the young males, from Appendix A:
As you can see, this procedure measured implicit attitudes about mustaches.