A two-hour debate from Cleveland will air at 9 p.m. Thursday on Fox.
The debate will feature the top 10 polling candidates. An hour-long forum set for 5 p.m., also to be aired on Fox, will feature the other seven GOP candidates running.
Here is a guide to the candidates, the issues and the debate:
From drama to dog poop, debates have a history of curveballs
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For continuous updates on political news, go to our Naked Politics blog.