Supreme Court Justice David Souter's decision to retire this year already has led to a swirl of speculation over who will replace him. 

Here's a list of possible nominees President Obama may consider:

-- Sonia Sotomayor, judge for the U.S. Court of Appeals for the 2nd Circuit 

-- Elena Kagan, solicitor general, former Harvard Law School dean 

-- Harold Koh, former Yale Law School dean, nominee for legal adviser to the State Department 

-- Deval Patrick, Massachusetts governor 

-- Leah Ward Sears, outgoing chief justice of the Georgia Supreme Court 

-- Janet Napolitano, Department of Homeland Security secretary 

-- Jennifer Granholm, Michigan governor 

-- Kathleen Sullivan, professor and former dean of Stanford Law School 

-- Cass Sunstein, law professor at Harvard University, Obama's choice to lead Office of Information and Regulatory Affairs 

-- Ruben Castillo, judge for the U.S. District Court for the Northern District of Illinois 

-- Margaret McKeown, judge for the U.S. Court of Appeals for the 9th Circuit 

-- Diane Wood, judge for the U.S. Court of Appeals for the 7th Circuit 

-- Kim McLane Wardlaw, judge for the U.S. Court of Appeals for the 9th Circuit 

-- Seth Waxman, former solicitor general 

-- Pam Karlan, law professor at Harvard University 

-- Sandra Lea Lynch, chief judge for the U.S. Court of Appeals for the 1st Circuit 

-- Merrick Garland, judge for the U.S. Court of Appeals for the District of Columbia Circuit 

-- Eric Holder, attorney general 

-- Karen Nelson Moore, judge for the U.S. Court of Appeals for the 6th Circuit 

-- Charles Ogletree, professor at Harvard Law School 

-- David Tatel, judge for the U.S. Court of Appeals for the District of Columbia Circuit 

-- Rosemary Barkett, judge for the U.S. Court of Appeals for the 11th Circuit 

-- Fortunato Benavides, judge for the U.S. Court of Appeals for the 5th Circuit 

-- Marsha Berzon, judge for the U.S. Court of Appeals for the 9th Circuit 

-- Jose Cabranes, judge for the U.S. Court of Appeals for the 2nd Circuit