Do accuracy and truth still matter on the campaign trail?

Some of the presidential candidates have been playing with the truth on the campaign trail. Political director Lisa Desjardins takes a look at some questionable comments, while Amy Walter of The Cook Political Report and Tamara Keith of NPR join Gwen Ifill to examine why candidates are emboldened to defy fact-checkers, plus a Gov. Chris Christie endorsement and the Planned Parenthood shooting.