Family has to come first, and he’s got to deal with the heartbreaking situation of his daughter’s ongoing illness. The Santorum family is going to be facing some real tough days ahead with his daughter’s situation.

Suspending the campaign allows for ongoing fundraising; quitting means that they can’t. There’s also the semantics of using suspending versus quitting. Suspending means that someone could potentially rejoin the race, though that really doesn’t happen.