"They've added new momentum to this, there's absolutely no doubt about that," said Fred Sainz of the Human Rights Campaign.
And Marc Solomon of Freedom to Marry said: "We are most definitely using the momentum that's come out of the weekend to continue to make the case to the administration."
The groups, however, are not planning special campaigns tied to Biden and Duncan's comments.
While an endorsement from Obama would boost their cause, the groups are focused on building support -- and using their resources -- where it would have more impact, namely at the state level and in the courts. The groups are also pressing the Democratic Party to include "marriage equality" in its platform ahead of its convention.
"This is a multi-front war," Sainz said.
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