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A look back at Justice Kennedy's most influential cases

Kennedy wielded enormous influence on issues like same-sex marriage, abortion rights, and the 2000 election.
Supreme Court Justice Anthony Kennedy gives the thumbs-up after taking the constitutional oath at the White House on Feb. 18, 1988 as President Ronald Reagan looks on.Doug Mills / AP file

In 30 years on the Supreme Court, Justice Anthony Kennedy wrote the majority opinion or was the deciding fifth vote in several landmark rulings, including on same-sex marriage, abortion rights and the recount of the 2000 presidential election.

Kennedy will retire at the end of next month, introducing a monumental change to the U.S. Supreme Court. Replacements are already being considered by President Trump.