Casey vs. Roe

A quick follow-up question to Michael Scaperlanda's post on the Roe/Casey distinction: can a Catholic judge "fully and faithfully" apply Casey given that its holding allows legalized abortion to persist?  A state law outlawing abortion under all circumstances, for example, would clearly constitute an undue burden.  Under such circumstances, assuming that a Catholic judge's application of Roe is morally problematic (and I'm not certain that it is), isn't the application of Casey similarly problematic?

Rob