From MSNBC’s First Read:

For the first time in a nationwide survey, more Americans say they support gay marriage (49%) than oppose it (46%), according to the latest Washington Post/ABC poll.
 
That 49% supporting gay marriage, in fact, is a significant jump from 2004, when the Post/ABC poll found just 32% in favor.
 
This surge within the past month suggests that any backlash against the recent moves across the country to legalize gay marriage has yet to emerge.
 
Also in the new survey, a majority of Americans (53%) believe that their state should recognize gay marriages from other states.
 
Other recent polls have shown a similar increase in support for gay unions nationwide. The New York Times/CBS News poll released this week showed 42% of Americans supporting gay marriage — the highest number ever recorded in that poll. This week’s Quinnipiac poll, which found a majority (55%) against gay marriage, also showed 57% of Americans support civil unions.

And CBS News:

Forty-two percent of Americans now say same sex couples should be allowed to legally marry, a new CBS News/New York Times poll finds. That’s up nine points from last month, when 33 percent supported legalizing same sex marriage.

Support for same sex marriage is now at its highest point since CBS News starting asking about it in 2004.

Twenty-eight percent say same sex couples should have no legal recognition – down from 35 percent in March – while 25 percent support civil unions, but not marriage, for gay couples.

As has historically been the case on this issue, liberals are more likely to support same sex marriage. Sixty-nine percent support the idea, while conservatives generally favor either civil unions (28 percent) or no legal recognition (44 percent).