Changing Attitudes on Gay Marriage
This is due in part to generational change. Younger generations express higher levels of support for same-sex marriage.
In 2013 Pew Research Center polling, Millennials are almost twice as likely as the Silent Generation to support same-sex marriage.
Source: Aggregated data from Pew Research Center polls conducted in each year.
Question wording can be found here (PDF), and information on the Pew Research Centerís polling methodology can be found here.