Actually, if either Carson or Christie drop out, before S.C., whoever they may endorse WILL have an impact if for Trump or Cruz.
But that is not likely to happen yet. As for now, where it stands, Trump just needs to keep to the message and he is going to win.
After Ben’s performance tonight, I really don’t see him staying in...maybe he stays through SC. Christie I don’t think will take the dive. It’s not hospitable territory for him and he got no bump off his Rubio attack in the last debate. I think he’ll pull the plug...JMO, though, and I’m certainly not a pundit.