Dismount your high horse.
No one is making fun of his daughter's illness.
However, I do think that this was an absolutely savvy move. His daughter, by his own words, has a life that was measured in days and weeks. It seems as though her death due to the illness (Edwards syndrome) is an inevitable fact; it is going to occur sooner than later, or some other health crisis in relation to it.
If Santorum had the majority of votes, he would not have dropped out at this time. But it was clearly a lost cause, in the fact of Romney's recent victories and the uphill battle ahead- a battle Santorum most likely would've lost.
His daughter's illness provided the perfect opportunity for him to drop out without having the stigma of having been truly beaten yet.
I don't doubt his daughter's illness or his love and concern. But it was opportune.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."