NBC has been making "The More You Know" PSA's for decades. They always feature celebrities of some sort making public advisements. At the bottom left of your link, President Obama's contributions are highlighted: "PRESIDENT BARACK OBAMA WITH A MESSAGE FOCUSING ON PARENTAL RESPONSIBILITY IN EDUCATION."
"You have a need to know" kind of makes sense as a non-endorsement of the network, doesn't it? And when ABC or CBS or FOX start a program like
The More You Know, which started in 1989, and then President Obama snubs them, I'll entertain your claims of endorsement.
Keep this in mind, too:
In 2010 and 2011, US president Barack Obama participated in the campaign, each time encouraging parents to be more involved in their children's educations.[2][3] Several past presidents have also participated, including President Bill Clinton and President George H. W. Bush.[4]
Here are some other examples:
http://video.adultswim.com/family-guy/t ... -know.html