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Source: Axios

The main super PAC supporting Republican Senate candidates plans to inject $5 million into the South Carolina campaign as an "insurance policy" to help GOP nominee Darline Graham, a source familiar with the move tells Axios.Why it matters: The GOP's concern that a Senate seat in blood-red South Carolina could be in play shows just how bad the political environment is for Republicans, who face a rash of troubles in states long considered conservative strongholds."It's an insurance policy. We're going to be there for Darline," said a Republican briefed on the plans for the Senate Leadership Fund.The shift to spending in conservative South Carolina comes after Senate Republicans announced they no longer were financing ads in swing-state North Carolina, where the GOP's Michael Whatley is lagging behind former Gov. Roy Cooper (D) in polls.Democrats, meanwhile, are reallocating resources in a way that reflects their optimism four weeks before Election Day.Democrats' main Senate super PAC canceled roughly $1.1 million in ad reservations in North Carolina, based on their belief Cooper is well-positioned to flip the seat now held by retiring Republican Thom Tillis.Zoom in: Graham, the sister of the late Sen. Lindsey Graham, was appointed to her seat in July at...