You can see the primary candidates here from 2012. I still think Peters commands enough support to be renominated in 2014, barring some hugely popular Black challenger. Clarke may run again, but unless this is an open seat, I don’t see him winning (and ‘14 may feature a depressed Black turnout as well, so a single White candidate absent Peters from Oakland County could take it).
I stand corrected. I’m pretty sure that a Jewish candidate from Southfield (a city or county officer IIRC) had filed to run, but I guess that he or she dropped out prior to the primary.