Demonstrators will take to the streets this week to protest Roe v. Wade, the 1973 Supreme Court decision that legalized abortion 40 years ago today.
The "March for Life" comes two months before another group of advocates -- gay-rights activists -- will head to the Supreme Court to hear a case that could produce their own landmark decision.
Gay-marriage supporters have disagreed at times about a strategy to achieve gay-rights equality, with some of them looking for lessons in Roe v. Wade.
Roe was a landmark decision for its supporters. They say that abortion is now safer and occurs earlier in pregnancy than ever before. But some supporters of a woman's right to choose have criticized the decision, arguing in part that the court ruled more broadly than it needed to.
When Roe v. Wade came down, abortion was illegal in 30 states, but some states were pushing toward liberalizing abortion laws. Roe called into question the criminal abortion statutes of every state, even those with less restrictive provisions.
Justice Ruth Bader Ginsburg, before she was nominated to the Supreme Court, wrote an essay in 1984 for the University of North Carolina School of Law arguing in part that Roe would have been "more acceptable as a judicial decision" if the court had focused on the extreme Texas statue that was before it instead of issuing such a sweeping decision.
"The political process was moving in the early 1970s," Ginsburg wrote, "not swiftly enough for advocates for quick, complete change, but majoritarian institutions were listening and acting. Heavy-handed judicial intervention was difficult to justify and appears to have provoked, not resolved, conflict."
It is something that has not been lost on gay-rights advocates.
In his book, "From the Closet to the Altar: Courts, Backlash, and the Struggle for Same-Sex Marriage," historian and legal expert Michael Klarman talks about the backlash Roe created.
"When the court intervenes to defend a minority position or even to resolve an issue that divides the country down the middle, its decisions can generate political backlash, especially when the losers are intensely committed, politically organized and geographically concentrated."
Klarman writes, "Roe v. Wade generated a politically potent right-to-life movement that helped elect Ronald Reagan president in 1980 and has significantly influenced national politics ever since."
Major gay-rights organizations plotted their own gay-marriage strategy years ago, hoping to move first at the state level to advance their cause to avoid a damaging federal court decision that might slow momentum or slam shut courthouse doors.
"It's no secret that increased political support for marriage equality at the local, state and national levels is obviously very helpful toward our ultimate goal of winning marriage equality across the country, whether it's through the Supreme Court or otherwise," Janson Wu, a staff attorney at Gay & Lesbian Advocates & Defenders, said.
Nine states and the District of Columbia allow gay marriage, and gay-rights advocates believe several other states will soon follow suit.