I can see Huckabee causing trouble for conservatives in Iowa. But Pansy entering as favorite son in SC only causes trouble for RINOs. He is not the favorite son of SC conservatives and if Fauxcahontas and Hitlery are fighting it out, they won’t get enough cross over dems to make a difference.
Understand that, in this case, all the RINO candidates would stay out of the state, leaving Graham with no competition from that side of the spectrum.
Accordingly, Graham would probably be strong enough to win at least a plurality in the South Carolina GOP primary -- and thereby deny Cruz a victory (and the delegates).
In fact, Cruz may not choose to run in South Carolina under these circumstances. Traditionally, a "favorite son" candidacy is a way for a state to remain "uncommitted" and it isn't contested.