If Jeb Bush doesn't do well in South Carolina, is he done?

The South Carolina primary may change the race for the shrinking GOP field. For candidates like former Florida Gov. Jeb Bush and Ohio Gov. John Kasich, this primary is a make-or-break moment. With more on what's at stake, CBSN political contributor Leslie Sanchez and CBS News senior political editor Steve Chaggaris join CBSN.