Public relations is often about encouraging people to change their opinions, or at least becoming open to the prospect. One of the largest changes in U.S. opinion on public policy in recent years has been the rise in support for same sex marriage.
And so the Pew Research Center's data on why so many people have recently changed their minds about gay marriage is intriguing. There are excellent interactive charts here, and here. And plenty of discussion of the data here.
The most common reason given (37% of those who changed their minds) is that people have family, friends, or acquaintances that are gay/lesbian. What does this say about how and why people change their opinions? --WTP