Indeed, I've read that there are pro-abort legal scholars who also think that Roe was so badly "reasoned" as to make it untenable.
This is precisely the point that these Catholic politicians should mention when discussing the issue. It's not a matter of their "imposing" Catholic teachings on non-Catholics through law, as if they were violating this "separation of Church & State" mythology that Kerry and the others keep harping on. The legal restrictions on abortion before Roe vs. Wade were not because the USA was run by the Vatican.