Because it’s good for him.
From President Obama’s video message to bloggers and activists at the Netroots Nation conference, 7/24/10 (which, as DailyKos’ Laurence Lewis points out, “used professional leftist Rachel Maddow to emphasize the good that he has done”):
While we’ve got a long way to go, I’m confident America is once again moving forward. Still, change hasn’t come fast enough for too many Americans. I know that. It hasn’t come fast enough for me either. And I know it hasn’t come fast enough for many of you, who fought so hard during the election. In fact, it took years to get here; it’ll take time to get us out. We’ve known that since the beginning of our campaign. [...]
What I’m asking you is to keep making your voices heard. To keep holding me accountable. To keep up the fight. … Change is possible. It’s possible when folks like you remember the fundamental truth of our democracy, that change doesn’t come from the top down. It comes from the bottom up. It comes from the Netroots, the grassroots, from every American who loves their country and believes they can make a difference.
From Obama’s speech to the Human Rights Campaign, 10/10/09:
For even as we face extraordinary challenges as a nation, we cannot and we will not put aside issues of basic equality. I greatly appreciate the support I’ve received from many in this room. I also appreciate that many of you don’t believe that progress has come fast enough. I want to be honest about that. Because it’s important to be honest amongst friends.
Now, I said this before, I’ll repeat it again. It’s not for me to tell you to be patient, anymore than it was for others to counsel patience to African-Americans petitioning for equal rights half a century ago. But I will say this: We have made progress, and we will make more, and I think it’s important to remember that there is not a single issue that my administration deals with on a daily basis that does not touch on the lives of the LGBT community.