Sadly, Obama and Hill won't be there together as Barack is the only one of the candidates who had a previous engagement:
Eight Democratic presidential contenders -- all except Illinois Sen. Barack Obama, who had a previous commitment in Iowa -- are coming to the western cattle call hosted Wednesday by the American Federation of State, County and Municipal Employees -- or AFSCME.
But don't expect the candidates to be mixing it up with one another. They won't be sharing the stage.
Instead, candidates will appear one after the other, each taking three questions from the audience in union-filled auditorium, read by moderator George Stephanopoulos of ABC News.
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