She's a bit out of her element. Mary Cheney, daughter of Vice President Dick Cheney, had made it her business to fly under the radar. She's a pro at shunning the limelight. As the openly gay daughter of a man running for office in a party opposed to gay marriage, she took the hits and let them slide off her. Kind of like Daddy.

Alan Keyes refers to her as a ''selfish hedonist''? Gay-rights activists lampoon her by putting her face on a milk carton (``Have you seen me?'')? Her sexual orientation becomes fodder for a presidential debate? No response.

Until now, that is. Cheney's self-written story of life as a political daughter, campaign strategist and happily partnered gay woman is out this month, with a carefully planned media campaign. At 37, she's trying out the Washington life and hitting the publicity trail while longtime partner Heather Poe consults with Cheney's mom, Lynne, about redecorating their new suburban Washington home.

Now It's My Turn: A Daughter's Chronicle of Political Life is primarily an insider's story on campaign politics. Cheney served as her father's personal aide in 2000, then as director of vice presidential operations on the 2004 campaign.

It's the other 10 percent of the book, though, that the title speaks to -- and that has earned early public focus, which is why she's moving through the ''GMA'' hallways.

Only a woman with Cheney's gift for understatement could write a book that essentially says she thinks the president -- that would be her father's boss -- is trying to ''write discrimination into the Constitution'' and that this effort is a ''gross affront'' to gays and lesbians everywhere.

That would be in that ''10 percent of the book'' -- Cheney's own description -- where she writes about coming out to her parents, how she felt about John Kerry and John Edwards bringing up her sexuality in campaign debates, and where she stands on the Federal Marriage Amendment Act, which would ban legal unions between same-sex partners. She opposes it and describes her own 14-year relationship as a marriage.

Actually, she manages to tackle a seminal issue in many gay people's lives in a handful of paragraphs: She was 16. She and her first girlfriend had just broken up. She skipped school, crashed the car, came home and decided it was time to just do it. Mom cried (''Your life will be so hard'') but quickly came around. Dad said he just wanted her to be happy.

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