a risky and desperate strategy: could hurt Harrison's potential for crossover support from pro-life/pro-gun/Trump voters by bringing up these issues of disagreement and telling them their views are "too conservative for South Carolina"
Goose egg.
If those people didn't exist this race would not be competitive.
This ad isn't meant to sway conservatives or moderates to Harrison's column. It's a very McCaskill-esque strategy of pushing conservative voters wavering on Graham to another candidate on the ballot.
Harrison will not be getting nor will he need a substantial number of Trump voters in a state as polarized as South Carolina. His key to victory is the Democratic base + disaffected anti-Graham conservatives voting third party.
The only reason this race is competitive is that he's running against Lindsey Graham.
