MICHAEL BARONE, AUTHOR OF SHAPING OUR NATION   As the White House and Congress debate immigration reform in the United States, host Carol Castiel and reporter Reuben Sanon speak with historian and political analyst Michael Barone about his new book “Shaping Our Nation: How Surges of Migration Transformed America and its Politics.” Barone explores how dramatic waves of immigration have sculpted the US political, economic and cultural landscape from pre-independence days to the present.