That is probably because it was quite funny. Too bad they didn't let them air the second spot later on in the evening.
You can still watch it though (and even see the whole unedited version) at godaddy.com's site...
Check it out over here.The more a commercial "walked the finest line of taste" as TiVo's Matt Wisk put it, the more popular it was, at least according to TiVo's yearly analysis of Super Bowl highlights. An advertisement that aired during the first quarter by Internet domain registrar GoDaddy.com had the highest replay activity of any commercial.