I think that you'd find that 'strict constitutionalists' and 'revisalists' (or whatever the opposite term is) both twist the meaning & intent of the Constitution to suit their own prejudices.
I do find it stunning that anyone could criticise the removal of the juvenile death penalty, though. In pretty much every other country in the world - only 6 other nations practice it* - I'd imagine+ it was & is considered pretty barbaric (aside from the entire capital punishment debate). That whole decision strikes me as being more of an endorsement of reinterpretation (if it is in fact that, and not simply a different viewpoint).
(as an aside, I can't see why the Constitution shouldn't be open to reinterpretation - it's a document drawn up a long time ago, and there has been vast societal and international changes since. Unless you want to perpetually try to hold society in a Victorian era state, some of it will most likely have to be acknowledged as anachronistic)
I suspect that, whichever candidate is selected will be done so politically (and both parties would do this); I can't help but wonder if it's the fairest thing to allow political control of any sort over the chief judiciary, because no administration will shoot itself in the foot by choosing a dissenter.
*these paragons of human rights are; Democratic Republic of the Congo, Pakistan, Yemen, Saudi Arabia, Nigeria, and Iran. Before outlawed this year, the US was highest.
+because I can't be arsed looking up any surveys....slight generalisation / exaggeration, but I believe it is definately true for the 'developed' world.