Justin McCarthy at Gallup:
U.S. support for legal same-sex marriage continues to trend upward, now at 70% -- a new high in Gallup's trend since 1996. This latest figure marks an increase of 10 percentage points since 2015, when the U.S. Supreme Court ruled that all states must recognize same-sex marriages.
These data are from Gallup's annual Values and Beliefs poll, conducted May 3-18.
Today's 70% support for same-sex marriage marks a new milestone in a trend that has pointed upward for a quarter of a century. A small minority of Americans (27%) supported legal recognition of gay and lesbian marriages in 1996, when Gallup first asked the question. But support rose steadily over time, eventually reaching the majority level for the first time in 2011.