The SC GOP rigs our primaries. Probably the same in AZ. There’s a reason the Establishment was so sure that Bush/Clinton would win—they thought they had it rigged—and the same way: dilute the field with lots of candidates.
If a handful of really conservative candidates got together and decided to outsmart the GOPe, they could all declare for Graham’s senate seat and trick the GOPe into thinking the field was sufficiently diluted.
Then have all but one drop out, as secretly prior arranged, and all endorse the sole remaining conservative. This would have to be at a point in time when it would be too late for the GOPe to “re-dilute” it.