De-commitments, or "flipping," happen several times during each college football recruiting cycle. With this day and age of early commitments, more and more committed recruits are re-thinking their decisions.
Some teams have a staff of coaches who stop recruiting committed prospects. Other staffs rather reduce their pursuit of a recruit who makes a pledge to another school. Yet, there are several staffs who increase their recruitment of a prospect they want, in order to get him to flip his pledge to their school.
Certain staffs actually excel at it, including a program in the Big Ten. An SEC powerhouse also doesn't get scared away from committed players, which is the same approach taken by an ACC juggernaut.