As this wave of progress ripples through the country, though, one group of people has been prominently left behind. In conversations with transgender people, again and again, I hear the refrain: Enjoy your cake, folks. Meanwhile, the rest of us remain at risk for discrimination and violence.

More than a few transgender people feel they’ve been sold out by the gay-rights movement and lament the way the “T” in “L.G.B.T.” always comes last. It makes me think, “A bunch of straight people in a room? That’s a conversation. A bunch of L.G.B.T. people in a room? That’s an argument.”

When you look at the staggering statistics concerning the struggles of transgender people, it’s easy to understand resentment over the amount of resources put into the fight for marriage rights. Transgender people, according to a nationwide study released early this year by the National Gay and Lesbian Task Force and the National Center for Transgender Equality, are nearly four times more likely to live in poverty than the general population. Forty-one percent of respondents reported attempting suicide; of those who came out as students, 78 percent reported harassment, 35 percent physical assault and 12 percent sexual violence. Nineteen percent said they had been homeless. Among transgender people of color, the numbers are even worse.

The right to marry clearly isn’t the most urgent civil rights issue lesbian, gay, bisexual and transgender (L.G.B.T.) people face.

Still, it’s not surprising that marriage rights came first. The lives of gay men and lesbians have finally become part of the fabric of American life. It seems to be harder for people to get their minds around the transgender experience. It takes a much larger leap of imagination for straight people to understand the difference between who you want to go to bed “with,” and who you want to go to bed “as.” Frequently, gay and lesbian people struggle with this distinction just as much as straight people do.