Send to a Friend

What happens to a candidate's campaign contributions after they drop out?
Today it is to be announced that the governor of my state, the estimable Scott Walker, will be withdrawing his candidacy for the office of President of the United States. Walker has received millions (probably) in campaign contributions, and a lot of that money came from private donors. What happens with that money now, if it has not all already been spent?
Using Fluther
or