In the first on the record confirmation of the Dem plan to insert a marriage equality plank into the party platform at the Democratic National Convention later this summer, the DNC is going out later this morning with an email informing its list of the decision:

I want you to be one of the first to know: After a unanimous decision on Sunday, the drafting committee for the Democratic National Convention embraced marriage equality as part of our platform for the 2012 Convention.

The next step will be for the full platform committee to vote on it, after which it will be presented to the delegates at the Convention in Charlotte for a final vote. Make no mistake: This is a historic step toward fairness for all. Once again, Democrats are fighting to move this country forward.

Please stand with Democrats today and support marriage equality for all Americans.

When President Obama became the first sitting president to support marriage equality, Democrats stood shoulder to shoulder with him. I still remember that day. I couldn’t stop smiling.

Now, it’s up to us to speak up for what he has called a simple proposition: that every single American deserves to be treated equally.

Add your name today and say you’re with Democrats as we fight for the right of every American to marry the person they love:

Thank you for standing up,

Congressman Barney Frank

Obama and Dems deserve great credit for taking this step, and so do all of those who applied relentless pressure on the president from the left to come out and state his support for gay marriage.

Republicans have been arguing that the Dem party embrace of gay marriage will give them an advantage against vulnerable Democrats in Senate and Congressional races, because it allows them to say that Dems have taken their eye off the ball on the economy. And it’s true that some Dems have been hesitant to embrace the president’s position on this issue, perhaps because they worry that it could hurt them politically in difficult states or districts. But another key question to ask is this: Are Republican candidates and incumbents really going to make an issue out of this, and risk looking as if they are dragging us back on to old culture war turf, which could (as some GOP stratetists have warned) make the party look hidebound, reactionary, and unwilling to accept cultural change? That will be another real tell.

A new Pew poll finds that a plurality of Americans now supports gay marriage, 48-44 (fixed), and a majority of independents now supports it, 51-40. But an even bigger majority of Republicans, 70 percent, still opposes it. That’s a big cultural shift over the last eight years; in 2004, a big majority opposed it. Republicans are alone in refusing to come to terms with where this is headed.

We’ll soon find out whether suppporting gay marriage is really the political risk people keep saying it is.