The SC Senator has been doing ok as of late. However, with his past unconstitutional coddling of the left he is partially responsible for their increased boldness.
I'll give you my take. I think McCain had "something" on Lyndsey, something that he held over his head that Lyndsey was terrified would get out. Pure blackmail.
I think Lyndsey's observed the Trump phenomenon, and learned that no matter the personal "scandal", conservatives can and will forgive personal indiscretions if you fight back against the over-arching tyranny of liberalism.
I think Lyndsey's in the process of rebuilding his conservative "street cred" in the event his "secret" makes it's way out.
But I also think this is closer to the real Lyndsey Graham, because he's having waaaaayyyy too much fun doing it.