I’d be happier if the news was that someone primarying Lindsey Graham raised $3.5 million in a month.
The Republican Party in South Carolina is quite happy with Lindsey. They do not care at all that he supports democrat initiatives by his comments and actions on a regular basis. All they care about is that he is an "R".
Most SC people are not political and pay little attention to the details of politics. Only a politician with high name recognition could unseat Lindsey, and the state Republican Party is not interested in supporting one.
If a democrat should unseat Lindsey, that person would be hard to unseat.