Sentence:  Organized by Fox News, the main stage, prime-time debate will involve only the candidates polling in the top 10. According to the most recent numbers, Trump, Bush and Walker are leading the way, with everyone else competing closely for the remaining slots — and to avoid the afternoon <WSD>kiddie table</WSD> debate. 
Meaning of the word marked with <WSD> tags:  The gathering place, forum, or venue assigned to less prominent, less capable, or less popular participants in an event.