CBS News poll: Tight race between Joe Biden, Bernie Sanders and Pete Buttigieg in Iowa
A new CBS News poll has Senator Bernie Sanders leading former Vice President Joe Biden and Pete Buttigieg in Iowa, but not by much. CBS News elections and surveys director Anthony Salvanto, Washington Post political reporter Sean Sullivan and CBSN political reporter Caitlin Huey Burns join CBSN's "Red & Blue" with a closer look.