This is an add that was produced by the National Organization for Marriage- an anti gay marriage organization.
In the add there is an attempt to show how gay marriage will effect the lives of people who don't support it; how their religious freedom will be taken away and how children will be taught in school to think that gay (god forbid) is o.k.
Here's a link to NOM's website where you can watch the video:
http://www.nationformarriage.org/site/c.omL2KeN0LzH/b.5075663/k.A89C/Religious_Liberty.htmThe whole thing is very scary and you can find a million response videos on You Tube: This is one video I found particularly informative:
http://www.youtube.com/watch?v=7YGe8DwBs-s