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Planned Parenthood v. Casey was a landmark Supreme Court case that reaffirmed the right to abortion established in Roe v. Wade. The case was co-authored by Justices Sandra Day O'Connor, Anthony Kennedy, and David Souter. Kennedy, a conservative justice, played a key role in crafting the majority opinion, which upheld the core holding of Roe v. Wade while also allowing states to impose certain restrictions on abortion.