In young men who voted for the loser of the 2008 presidential election, testosterone levels dropped after the result was announced. (2009)
From the article:
Female study participants showed no significant change in their testosterone levels before and after the returns came in.
The men who participated in the study would normally show a slight night-time drop in testosterone levels anyway. But on this night, they showed a dramatic divergence: The Obama voters' levels didn’t fall as they should, and the McCain and Barr voters lost more than would have been expected.
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The findings mirror what other studies have found in men who participate directly in an interpersonal contest – the winner gets a boost of testosterone, while the loser’s testosterone drops.