Brown County (Green Bay) and the nearby Fox River Valley make up the state's third major battleground.

CNN: Debate reaction from a hotly contested state

All the Republican candidates had been invited to debate this week in Des Moines, not only at the Brown and Black Forum but also at a TV event to be sponsored by the Republican Party of Iowa and Fox News and a radio-only event sponsored by Iowa Public Radio and NPR News.

NPR: Huckabee, Obama Gain Edge in Iowa Poll