Roberts again
I don't give a happy horseshit whether he's decent, brilliant, collegial, fair-minded, responsible, well-respected, etc, etc.
I only want him to be LITERATE.
That's all it requires: a Supreme must actually READ the Constitution. The legacy one that was written in 1789, not the one that consists of the collected treasonous ravings of black-robed saboteurs.
A literacy test is simple:
"Do you disagree with any of Justice Thomas's decisions?"
If he won't answer the question, he doesn't deserve support. If he can think of more than one or two minor disagreements, he doesn't deserve support.
Why is this so difficult and subjective? If you wanted to hire 9 baseball players, you'd look for a variety of talents and specialties, but you'd want all 9 to play by the rules of baseball, not the rules of soccer or curling. If you were hiring 9 C++ programmers, you'd seek different talents and specialties, but you'd want all 9 to write C++ code that compiles under the Stroustrup standard. You wouldn't want them to produce Shakespearean sonnets or Faulknerian novels, no matter how fine such writing may be in other circumstances.