Some recent research seems to show that voting location matters. Even when you controlled for where people lived, political views, demographics, etc., voters who cast ballots in schools in the 2000 Arizona elections were more likely to vote for Proposition 301, which proposed raising the state sales tax to increase education spending.
In subsequent lab research the authors found other effects, such as voters who cast ballots in or near churches being less likely to vote for stem cell initiatives. Again, the researchers controlled for demographic and other confounds.
While the opportunities for mischief here are legion, it is another reminder of the overlooked influence of location on mindset and decisionmaking.