Upcoming Republican Debates February 22, 2012 8pm ET on CNN (Originally Dec 1, then Nov 30) Location: Mesa Arts Center in Mesa, Arizona  Sponsor: CNN and the Republican Party of Arizona  Participants: Unknown March 1, 2012 8pm ET on CNN Location: Georgia  Sponsor: CNN and the Georgia Republican Party Participants: Unknown March 5, 2012 Air time TBD on NBC Location: Reagan Library in Simi Valley, CA  Sponsor: Reagan Library, NBC News and Politico Participants: Unknown March 19, 2012 Air time TBD on PBS  Location: Portland, OR  Sponsor: Oregon Public Broadcasting, NPR, PBS, and The Washington Times Participants: Unknown