Poll: Support for gay marriage up four points since last year

These political differences in support for gay marriage may stem from even larger differences by religion. Americans who say religion is “very important” in their lives oppose legal same-sex marriage by 70% to 27%. In contrast, Americans who say religion is not important to them support gay marriage by just as wide a margin.

Differences on the issue are also apparent by religious affiliation. Notably, 81% of Americans who claim no religious affiliation favor legal same-sex marriage. That compares to 48% support among Catholics and 33% among Protestants (including those who identify as Christian but do not specify a particular Christian denomination).