From The New York Times,
here, the following Republicans have added their names to a brief opposing the 7 million people of California who passed the 2008 ballot proposition 8 defining marriage as between a man and a woman:
Theodore B. Olson, the former solicitor general under Mr. Bush;
Meg Whitman, who supported Proposition 8 when she ran for California governor;
Representatives Ileana Ros-Lehtinen of Florida and Richard Hanna of New York;
Stephen J. Hadley, a Bush national security adviser;
Carlos Gutierrez, a commerce secretary to Mr. Bush;
James B. Comey, a top Bush Justice Department official;
David A. Stockman, President Ronald Reagan’s first budget director;
Deborah Pryce, a former member of the House Republican leadership from Ohio who is retired from Congress;
Jon M. Huntsman Jr., the former Utah governor, who favored civil unions but opposed same-sex marriage during his 2012 presidential bid;
Christine Todd Whitman, former governor of New Jersey;
William Weld and Jane Swift, both former governors of Massachusetts;
Ken Mehlman, the former chairman of the Republican National Committee, who came out as gay several years ago;
Steve Schmidt, senior adviser to the 2008 Republican presidential nominee, Senator John McCain of Arizona;
Seth P. Waxman, a former solicitor general in the administration of President Bill Clinton;
Reginald Brown, who served in the Bush White House Counsel’s Office.
I didn't leave the Republican Party. The Republican Party left me.