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By CNN’s Dugald McConnell and Brian Todd
(CNN) - So what are Tuesday's Iowa caucus-goers like – and how do they compare to the rest of the U.S. population?
Here's a thumbnail profile, by the numbers.
For starters, they are not a big group. In 2008, about 119,000 people voted in Iowa's Republican caucuses - which is about the same as the population of Allentown, PA.