Or so goes the logic of some conservatives who suggest the decline of today’s left is directly attributable to Roe V. Wade. By winning that lawsuit, the political left aborted itself out of power. This explanation does not seem so unreasonable.
If true, shouldn’t conservatives be at least a little bit apprehensive about trying to outlaw abortion? Which, according to the logic, would mean an increase of liberal babies who will become liberal voters.
Be careful of what you wish for I guess.

Huh? How would there be more liberal babies? I think it’s much more plausible, as Freakonimics suggests, that there would more crime, less prosperity and more cash strapped single parents on welfare. Are you saying that those people would likely be more liberal? And if so, they’d be voting? This is a big stretch.
I think the political left is in decline because of a beautifully orchestrated and well funded GOP infrastructure that has put the left on the defensive. Thanks *in part* to things like Roe v. Wade that supply the GOP infrastructure with ample ammunition to appeal to the “family values” and “moral” voters.