South Carolina Sen. Darline Graham is making major headway with the Republican establishment in the primary race to succeed her late brother Lindsey Graham. President Donald Trump was the first in her corner, encouraging Darline Graham to get in the race last week. Despite South Carolina’s deep-red hue, its surprising new primary race matters because the nominee will face a well-funded Democrat, Annie Andrews, in November. Mark Lynch, who ran unsuccessfully against Lindsey Graham, is also preparing to run against his sister. On top of that, Darline Graham faces a review of her eligibility to run for the seat by a state county GOP chairman.