While the president held the first ever Twitter Town Hall today, Republican candidates are lining up to face Obama in the 2012 presidential race. Our Carol Marin and her panel of political analysts will discuss the growing field and more.

Chicago Tribune: 2012 Campaign pageThe New York Times: 2012 Campaign pageWashington Post: 2012 Campaign pageRasmussen Reports: Daily Presidential Tracking PollsReal Clear Politics: 2012 Republic Presidential NominationsOn The Issues