Writing today in The Public Discourse, Matthew J. Franck probes "the prominence of [the] assault on reasoning itself" within the movement to redefine marriage:

Rather than say what marriage is—which anyone can see is an absolute prerequisite to saying whether "equality" demands its availability to partners never before thought capable of marrying—these advocates simply shout "marriage equality" ever more loudly, point to an array of "government benefits" linked to marital status, and make their desire for the thing substitute for an argument about what the thing is that they want.

You can read the rest of his article here.