Unusual Friend Requests

If you know me well, you know I'm kinda addicted to FaceBook. I love to see how things are working out for family and friends in other places.

I've had a few people I don't know ask to be my "FaceBook friend" but I usually just ignore them. I do, however have a few people in my friend list that I do not know, and that I did not ignore:

Steven Ertelt, the man behind LifeNews.com

Bill McCollum, the Attorney General of Florida.

Jeff Kottkamp, the Lieutenant Governor of Florida.

And now I'm trying to figure out
1) how they found me?
2) why they would want to be my friend? and,
3) if I should be flattered? wary? or just chalk it up to free advertising for them?