Austin

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** FILE ** San Antonio Mayor Julian Castro speaks during the Civil Rights Summit at the Lyndon B. Johnson Presidential Library, Tuesday, April 8, 2014, in Austin, Texas. (AP Photo/Statesman.com, Deborah Cannon, Pool)

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Former U.S. President Jimmy Carter speaks onstage with Mark Updegrove, director of the Lyndon B. Johnson Presidential Library in Austin, on the first day of the Civil Rights Summit, Tuesday, April 8, 2014, in Austin, Texas. (AP Photo/Statesman.com, Ralph Barrera, Pool)

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Attorney David Boies discusses the issue of gay marriage at the Civil Rights Summit at the LBJ Presidential Library on Tuesday, April 8, 2014 in Austin, Texas. Former President Jimmy Carter will be the keynote speaker on the first day of the Civil Rights Summit at the LBJ Presidential Library in Austin, Texas. The summit opens Tuesday and marks the 50th anniversary of the Civil Rights Act of 1964, which outlawed discrimination in public places based on race, ethnicity, religion or gender. (AP Photo/Austin American-Statesman, Jay Janner, pool)

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AttorneyTheodore B. Olson discusses the issue of gay marriage at the Civil Rights Summit at the LBJ Presidential Library on Tuesday, April 8, 2014 in Austin, Texas. Former President Jimmy Carter will be the keynote speaker on the first day of the Civil Rights Summit at the LBJ Presidential Library in Austin, Texas. The summit opens Tuesday and marks the 50th anniversary of the Civil Rights Act of 1964, which outlawed discrimination in public places based on race, ethnicity, religion or gender. (AP Photo/Austin American-Statesman, Jay Janner, pool)