You are more confident about that than I, although I plan to vote for the candidate most likely to give Graham the best challenge in the open SCGOP Primary.
Graham has a war chest and the support of most Dems in SC, although it was the conservative voters who initially upped him from Congressman to Senator. Since early in office as Senator, he has spurned the S.C. conservatives who brought him to the dance.
Crossover Dems voting for Graham in the GOP Primary Election combined with name recognition by regular dumb GOP voters should be adequate to keep him in the U.S. Senate for as long as there’s a U. S. Senate. Unless we can get a closed primary system in S.C. and that is not very encouraging at the present time.
No, I'm afraid I don't have much confidence that Lady Lindsey will go until he/she wants to leave. Such is the situation of the last decade's 'Operations: FUB*R' by those DC traitors who claim to represent We The People.