I wouldn't sign the pledge if I were him either.
Additionally, if I were him and was lapping the field, I wouldn't bother to attend any of the debates. Nothing to gain for him in doing so. At this point, he can pretty much dictate his own terms as to when, where and who he wants to debate, if at all.
Additionally, if I were him and was lapping the field, I wouldn't bother to attend any of the debates. Nothing to gain for him in doing so. At this point, he can pretty much dictate his own terms as to when, where and who he wants to debate, if at all.