A narrow majority of Americans support gay marriage, according to a new poll released Wednesday.

Fifty-one percent of respondents said they support marriage equality.

The ABC News/Washington Post survey is the fifth in a row since March, 2011 to find a majority in favor of gay nuptials.

Opposition in this poll has increased 8 points since May due to a change in wording. The May poll found 39 percent in favor of making such unions “illegal,” while today's poll finds 47 percent “opposed.”

It is the first nationwide poll to be released since four states voted on the issue on November 6. In three of those states – Maine, Maryland and Washington state – voters legalized the institution, while Minnesotans voted against banning it.

Eighty-one percent of those who describe themselves as “very conservative” and seventy-five percent of senior citizens oppose marriage equality, while large majorities of young people under 29 (66%) and Democrats (62%) support it. Majorities of Hispanics (53%) and whites (51%) support such unions, but African-Americans are against it by a 51-43 margin.

The telephone survey of 1,023 random adults was conducted November 7-11.