Long list of candidates mentioned in the past here: http://en.wikipedia.org/wiki/Barack_Obama_Supreme_Court_candidates

Article from 2012 with a list of possibilities here: http://www.cnn.com/2012/09/30/politics/court-obama-list/index.html

UPDATE: A new article from May 2013 with additional possibilities (some not on the below poll) here: http://thinkprogress.org/justice/2013/05/23/2044771/ten-potential-democratic-supreme-court-nominees-who-arent-named-sri-srinivasan/
(Jane Kelly, Alison Nathan, Deval Patrick, Pam Karlan, Paul Smith, Neal Katyal, Tom Perez)
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Kathryn Ruemmler, born 1971, bio: http://en.wikipedia.org/wiki/Kathryn_Ruemmler
Goodwin Liu, born 1970, bio: http://en.wikipedia.org/wiki/Goodwin_Liu
Sri Srinivasan, born 1967, bio: http://en.wikipedia.org/wiki/Sri_Srinivasan
Paul Watford, born 1967, bio: http://en.wikipedia.org/wiki/Paul_Watford
Caitlin Halligan, born 1966 http://en.wikipedia.org/wiki/Caitlin_Halligan
Kamala Harris, born 1964, bio: http://en.wikipedia.org/wiki/Kamala_Harris
Lisa Madigan, born 1966, bio: http://en.wikipedia.org/wiki/Lisa_Madigan
Jacqueline Hong-Ngoc Nguyen, born 1965, bio: http://en.wikipedia.org/wiki/Jacqueline_Hong-Ngoc_Nguyen
Harold Hongju Koh, born 1954, bio: http://en.wikipedia.org/wiki/Harold_Hongju_Koh
Other

Poll below...