TBH, they are probably aging out. The RWNJs will go crazy for someone even younger and willing to spout all the things that tickle them in their naughty bits - basically spouting the kind of things their father/grandfather/great grandfather might have said during Klan rallies or Bircher meetings.

You’ll notice that you hear even less from Failin’ Palin and Michele Bachmann, but they are even older.