What Walker’s campaign bow out means for the GOP race

Aired: 9/21/2015 | 0:10:30 | Clip
Wisconsin Gov. Scott Walker announced he was dropping out of the presidential race after falling behind in the polls. Gwen Ifill discusses Walker’s decision with Susan Page of USA Today and Amy Walter of the Cook Political Report, plus Ben Carson’s comments on whether a Muslim should be president, scrutiny of Carly Fiorina’s career and whether Hillary Clinton is hitting her stride.