Sentence:  Wellborn said it might not be so much "crossovers" as "<WSD>crossbacks</WSD>" — Republicans returning to the party fold after their 1972 flirtation with Wallace — who would help Reagan upset Ford. 
Meaning of the word marked with <WSD> tags:  A return to the original course of action by one who previously changed to a different course of action, or the person making that return.