Both of the Cheneys' daughters - Elizabeth and Mary, who is a lesbian - are working in the vice president's campaign. Mary Cheney is director of vice-presidential operations for the Bush-Cheney campaign. She was her father's assistant in the 2000 race and helped the GOP recruit gay voters during the 2002 midterm elections. She has been less visible this year while traveling with her father or working at campaign headquarters in Arlington, Va., but will play a more public role as the election nears, campaign aides say.