Abortion and birth control are divisive issues in politics, and they've flared up at times in this campaign despite the candidates' reluctance to dwell on them.
President Barack Obama supports abortion rights. And his health care law requires contraceptives to be available for free for women in workplace health plans.
Republican Mitt Romney opposes abortion rights, though he previously supported them. He says the Supreme Court ruling establishing abortion rights should be reversed, allowing states to ban abortion. He's also criticized mandatory coverage for contraception as a threat to religious liberty.
Romney's ability as president to enact federal abortion restrictions would be limited unless Republicans gained firm control of Congress. But the next president could have great influence over abortion policy if vacancies arise on the Supreme Court. If two seats held by liberal justices were filled by Romney-nominated conservatives, prospects for a reversal of Roe v. Wade would increase.