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'Caucus' -- Why Iowa matters

Iowa--the place where presidential hopefuls flock, and now the subject of a new documentary, aptly titled, "Caucus." Filmmaker A.J. Schnack joins msnbc to...
/ Source: MSNBC TV

Iowa--the place where presidential hopefuls flock, and now the subject of a new documentary, aptly titled, "Caucus." Filmmaker A.J. Schnack joins msnbc to...