David Frum raises a crucial non-issue for Democrats

I love David Frum's diagnoses of what's wrong with the Republican party (for many years now, he's had the no doubt unsettling experience of being admired more by his political adversaries than by his putative allies). But as he now takes a turn at prescribing a healthy political evolution for Democrats, he's spinning his wheels.

Frum warns (or concern-trolls) Democrats that if they simply anoint Hillary Clinton in 2016, they'll miss a revivifying debate on core elements of the party's future direction, defined thus:

* Were President Obama's counter-terrorism policies effective and necessary? Or did they over-reach and violate important liberties?

* Is Obamacare a charter for regulated competition among private health insurers? Or is it a deeply flawed half-way step on the way to Medicare for all?