What does all this boil down to legally in the short term? Not much. Little will change immediately at the federal level because of the president's statement today, but it's doubtless psychologically meaningful for many people.
Leaders lead. Today our president showed us what leadership looks like by affirming that the equal protection guaranteed by the Constitution should actually protect all Americans -- including those Americans married to spouses of the same sex.
Whatever led Obama to fully evolve, the fact that a sitting president proclaimed that we should be free to marry whomever we love and want to share our live with is a big deal worthy of celebration, but only to a point. The civil rights reality for gay couples remains mixed.