WASHINGTON (April 28, 2015) — Excerpts from arguments before the Supreme Court on Tuesday about whether states must allow same-sex couples to marry and whether states must recognize gay marriages performed in other states:Chief Justice John Roberts, on the institution of marriage: "You're not seeking to join the institution, you're seeking to change what the institution is. The fundamental core of the institution is the opposite-sex relationship and you want to introduce into it a same-sex relationship."