Ever since Roe v. Wade was handed down in 1973, the polls have quite clearly shown two things: first, that about two-thirds of Americans favored it, and secondly, that about two-thirds opposed what it said.
Most Americans are not lawyers. "Roe v. Wade" has become code for "legalized abortion," and most Americans think that at least some abortions should be legal. Hence, the popularity of the code.
The Democrats have dug themselves quite a hole by their absolutist position on Roe, given the fact that such a large majority of Americans oppose abortion for most of the reasons why abortions are performed in this country. I predict that Republicans are about to make them regret it by fighting to restrict abortion rights rather than eliminate them. While I disagree with Chris Stirewalt in equating this strategy with embracing gay "marriage" (if there is a "middle ground" in the gay "marriage" debate, it's civil unions, and the current surge in support for it is due not to deeply held convictions on the part of the American voter but rather the simplistic definition of the issue by the cultural Left and the effective silencing of the other side), I don't think there's any question that he's right on target in predicting that the Democrats are in for a rude awakening on this issue.
The Democrats have locked themselves into the extremist position here, and there's no backing out.