Why Do Cows Support Chick-Fil-A?

I happened to catch a PBS (public television here in the US) broadcast that showed a Chick-Fil-A sponsorship spot. Since this is public TV, companies aren't allowed to advertise directly.

Chick-Fil-A (pronounced Chick-filay) is a quirky, privately-owned fast-food chain that specializes in yummy chicken sandwiches; they're known for ads featuring cows that encourage people to "eat mor chiken"; it's a fun ad campaign with a delightfully subversive tone, and it's apparently served them well. They just had to tune it a bit for PBS:

SCENE: A live black and white cow with a Chick-Fil-A sign draped over its side. Camera starts in close on the head, pulls slowly back to reveal more of the cow, and a handwritten wall sign that says "All In Favor Say Moo"

VO (even tone): Why are cows everywhere such strong supporters of Chick-Fil-A?

pause

VO: Perhaps it's because Chick-Fil-A supports quality family programming here on PBS.

Riiiight...