Perhaps it's because he doesn't prance about openly stabbing conservatives in the face every few days.
Ah, he just quietly stabs conservatives in the back behind the scenes while falsely portraying himself as "Mr. Conservative" in public.
That's actually worse in my book.
I also rate the Bolton lynching as worse than shamnesty, in that shamnesty blew up in their faces, but the Bolton lynching succeeded in ruining a great dipolmat's career.
Though Thune admitted during the Bolton lynching that he didn't intend it as a one time thing and would become a permanent thorn in the side of conservatives if he didn't get his way on Ellsworth Air Force Base. Fortunately for him, most of this forum has amneseia.