American views on same-sex marriage

Any thoughts on this?
Vanderbilt University just did a study on who is most likely to be accepting of same-sex marriages on the American continents. 
Most accepting age: younger people
Most accepting countries: Canada, Uruguay, Argentina, USA, Brazil
Least accepting countries: Jamaica, Haiti, Guyana, Belize, Bahamas
Least accepting religious populations: Catholic, evangelical, Protestant
Here is the article: http://www.vanderbilt.edu/lapop/insights/ITB021en.pdf