The geriatric race for the Presidency is a worry, but it's a symptom not a cause, like the composition of SCOTUS.
It'd be nice if some of the embarrassing Washington pundits—who always end up writing as if the necrotic US political system is some reason to shed a single jewelled tear at the miracle of democracy—would mount a deeper critique, but my guess is the spectacle will just be the usual come November.
