A same-sex marriage supporter waves a rainbow flag outside the Supreme Court in 2015. Drew Angerer/Getty Images

Congress is considering making same‑sex marriage federal law – a political scientist explains how this issue became less polarized over time

The U.S. House of Representatives recently voted for a bill that would federally protect same-sex marriage – and 47 Republicans signed on, too. Same-sex marriage isn’t the partisan issue it once was.

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