They were close colleagues. This is from the New Yorker in 2010:
As a rising politician with Ivy League connections, Obama had financial backing from all over, including from a class of young black entrepreneurs. But he has had Jewish mentors throughout his career. Philanthropists like Bettylu Saltzman, Penny Pritzker, and Lester Crown were crucial to his campaigns. His friend and neighbor the late Arnold Jacob Wolf was a rabbi. Michelle Obama’s cousin Capers C. Funnye, Jr., is the first African-American member of the Chicago Board of Rabbis and the spiritual leader of Beth Shalom, a congregation on the South Side. One of Obama’s closest colleagues in Springfield was Ira Silverstein, an Orthodox Jew, with whom he shared an office suite in the Capitol building; Obama acted as Silverstein’s shabbos goy, turning on lights and pushing elevator buttons for him on Saturdays.
Read more: http://www.newyorker.com/talk/comment/2010/03/29/100329taco_talk_remnick#ixzz2LZl8gLSJ [newyorker.com]
Senator Ira Silversteen, the man behind the bill, is the Illinois majority caucus whip - effectively third in line in the IL senate. He shared an office suite with Obama. They were close colleagues. This is from the New Yorker in 2010:
As a rising politician with Ivy League connections, Obama had financial backing from all over, including from a class of young black entrepreneurs. But he has had Jewish mentors throughout his career. Philanthropists like Bettylu Saltzman, Penny Pritzker, and Lester Crown were crucial to his campaigns. His friend and neighbor the late Arnold Jacob Wolf was a rabbi. Michelle Obama’s cousin Capers C. Funnye, Jr., is the first African-American member of the Chicago Board of Rabbis and the spiritual leader of Beth Shalom, a congregation on the South Side. One of Obama’s closest colleagues in Springfield was Ira Silverstein, an Orthodox Jew, with whom he shared an office suite in the Capitol building; Obama acted as Silverstein’s shabbos goy, turning on lights and pushing elevator buttons for him on Saturdays.
Read more: http://www.newyorker.com/talk/comment/2010/03/29/100329taco_talk_remnick#ixzz2LZl8gLSJ
This does not prove the categories are a priori. There were only 5 subjects who all had similar history (upbringing in the modern western world). That is not empirical evidence, at best it is a suggestion.
You've added a sociological dimension, so you must be speaking of the a posteriori.
The faster I go, the behinder I get. -- Lewis Carroll