I agree that the SCOTUS abrogated its responsibility in refusing to hear any of the Obama constitutional eligibility cases in which they denied certiorari from lower courts. But, unless I'm missing something, the SCOTUS never invoked the 20th Amendment in those cases. They didn't have to because the cases never came before them. There were no SCOTUS opinions written on the Obama eligibility issue.
Precisely. They didn’t rule because they abrogated their responsibility. Choosing not to rule on a case is the same as upholding a lower court ruling. Abrogation, indecision, simply not doing their FReeping job. As a result, our republic was lost in 2008. We are witnessing its death throes now. Like a warrior who receives a spear in the belly, it takes a while for him to die. But the wound itself is fatal to our constitutional republic.