Researchers have found that voters prefer candidates with lower-pitched voices:
Participants in the study, published in the journal of Evolution and Human Behavior, were asked to listen to archival voice recordings of nine U.S. presidents. The researchers, from Canada's McMaster University, created higher- and lower-pitched versions of each voice. Listeners were then asked to assess the attractiveness, honesty, leadership potential and intelligence — among other qualities — of the speakers.
For nearly every attribute they were asked to rate, participants were significantly more likely to prefer the deeper voice. The only category in which higher voices won? Most Likely to Be Involved in a Government Scandal.