Gay rights activist Zach Wahls has said that President Barack Obama's gay marriage endorsement left him emotional.

Wahls is the University of Iowa student who defended his two-mom family at an Iowa House hearing considering a proposed measure which would repeal the state's gay marriage law by defining marriage as a heterosexual union in the Iowa Constitution. A video of Wahls' testimony attracted more than 18.3 million views to become the most-watched video in 2011.

In a new video for the Obama campaign, Wahls discusses getting emotional over the news.

“The president announcing his support, it was a beautiful day,” Wahls said. “You know, I'm not a particularly emotional guy but I started getting choked up and I couldn't believe it. And then, I called my mom, Terry, and she answered the phone and I asked, 'Did you hear about the president?' And she said, 'What are you talking about?' I said, 'President Obama just endorsed same-sex marriage.' And she says, 'Are you kidding?' And I can hear her go silent for a minute and then she starts getting emotional, too.” (The video is embedded in the right panel of this page. Visit our video library for more videos.)