I'm pretty sure there were RINOs saying the same thing about slavery a century and a half ago.
The price was very high.
Is that what you are after?
There are actually many similarities between slavery and abortion, as I have posted here many times.
Each is a "peculiar institution", for which all normal laws and rules have to get out of the way, each creates irreconcilable antagonisms between defenders and opponents, each embeds a "way of life" which cannot survive without the institution. And each represents the triumph of evil over good.
That having been said, the position of the antiabortion forces now is much weaker than the position of the proslavery forces in 1860 (I analogize the two because each is arrayed against the power of the Federal government).
The proslavery forces had a compact territory to defend wherein their institution could survive, the antiabortion forces need to overturn the Federal government, or radically reduce its power, to prevail.
It's my view that this battle will not be won be electing Republican presidents, of whatever rhetorical stand with regard to abortion, and I think that the history of the increasing abortion carnage since 1973 bears this out.
The people have to be convinced that their present lifestyle rests upon an enormous evil, and that they must give up the evil although this will result in their lifestyle, which they love and desire intensely to continue, being altered.
This of course is very difficult, whereas electing candidates who pretend they are going to do something substantial is easier.
True enough!