I can't remember where I heard this idea, but someone once proposed a dual track system of civil marriage: one track would be indissoluable along Catholic lines; the other could be whatever everyone else wants. This could be implemented state-by-state. The result, one hopes, would be an increase in social prestige and incentive for the permanent marriage track.
Anyway, would the liberals have any objection to this? Live and let live, right? What's not to like about it? Or would they see this as horribly unegalitarian, creating "first class" and "second class" marriages?