Some commentators are comparing the impact of Roe vs Wade to the upcoming Supreme Court deliberations on gay marriage.
The basic thread of the political musings being: should the Supreme Court impose what is a legitimate right (gay marriage) on the whole country?
Because actually, as the years go by gay marriage is being voted through, state by state, and it's proving that there is no threat to hetero marriage, or the country, or whatever. And gradually, more and more people are realising that their opposition is groundless, and going state by state means that in the future, it will be an almost complete non-issue.
The other point of view is, "Fuck that, gay people have waited long enough for marriage equality".
From a political point of view, the comparison to Roe vs Wade is that federal imposition of this law in ALL states provides a rallying point around which conservatives can safely fulminate.
I didn't express that all very well, but I'm in the middle of feeding the kids.