Abortion rights protesters hold signs as anti-abortion activists march past the Capitol to the Supreme Court in Washington, Friday, Jan. 25, 2013, as they observe the 40th anniversary of the Roe v. Wade decision. Thousands of anti-abortion demonstrators marched through Washington to the steps of the U.S. Supreme Court to protest the landmark decision that legalized abortion. (AP Photo/J. Scott Applewhite)

Abortion rights protesters hold signs as anti-abortion activists march past the Capitol to the Supreme Court in Washington, Friday, Jan. 25, 2013, as they observe the 40th anniversary of the Roe v. Wade decision. Thousands of anti-abortion demonstrators marched through Washington to the steps of the U.S. Supreme Court to protest the landmark decision that legalized abortion. (AP Photo/J. Scott Applewhite)

Sisters from the Disciples of the Lord Jesus Christ Franciscan community in Prayer Town, Texas, near Amarillo, join anti-abortion activists at the Supreme Court in Washington, Friday, Jan. 25, 2013, as they observe the 40th anniversary of the Roe v. Wade decision. Thousands of anti-abortion demonstrators marched through Washington to the steps of the U.S. Supreme Court to protest the landmark decision that legalized abortion. (AP Photo/J. Scott Applewhite)

Anti-abortion activists march past the U.S. Supreme Court in Washington, Friday, Jan. 25, 2013, as they observe the 40th anniversary of the Roe v. Wade decision. Thousands of anti-abortion demonstrators marched through Washington to the steps of the U.S. Supreme Court to protest the landmark decision that legalized abortion. (AP Photo/J. Scott Applewhite)

Anti-abortion activists march past the U.S. Supreme Court in Washington, Friday, Jan. 25, 2013, as they observe the 40th anniversary of the Roe v. Wade decision. Thousands of anti-abortion demonstrators marched through Washington to the steps of the U.S. Supreme Court to protest the landmark decision that legalized abortion. (AP Photo/J. Scott Applewhite)

Anti-abortion activists march past the Supreme Court in Washington, Friday, Jan. 25, 2013, as they observe the 40th anniversary of the Roe v. Wade decision. Thousands of anti-abortion demonstrators marched through Washington to the steps of the U.S. Supreme Court to protest the landmark decision that legalized abortion. (AP Photo/J. Scott Applewhite)