Edwards backers excluded from CNN interview on South Carolina Black voters

At this stage in the Democratic primaries why would CNN or any media outlet exclude supporters of any major candidate? Today, Friday, CNN "domestic" service interviewed two Black South Carolina religioius leaders, Revs. Timothy Browne (Cleveland Chapel Baptist Church) and Joseph Darby (Morris Brown AME Church; AME = African Methodist Episcopal, a Black American Christian denomination). It's also worth noting that no women were interviewed.

Rev. Browne said he supports Clinton. CNN introduced Rev. Darby, claiming declaring him among Barack Obama's supporters. Darby quickly corrected CNN's interviewer, pointing out he isn't supporting anyone yet. Looks like somebody at CNN must have "mis-underestimated" their homework... With apologies and a hat tip to GW Bush (sic). So why didn't CNN include an Edwards supporter?