Rubio, Priebus, Barbour, Blackburn Sunday on Face the Nation

Vice President Joe Biden promised the families of fallen soldiers one day "the thought of your son or daughter or your husband or wife" will bring a smile to their lips before it brings a tear to their eyes. Bob Schieffer joins him in hoping that day comes sooner rather than later for all.

Sunday, live from Tampa, Fla.: A conversation with Sen. Marco Rubio, R-Fla. 

Plus, a discussion with key voices in the Republican party: RNC Chairman Reince Priebus, platform committee co-chair Rep. Marsha Blackburn, D-Tenn., and former Gov. Haley Barbour, R-Miss. 

Then, a roundtable with The Wall Street Journal's Peggy Noonan, TIME's Rich Lowry, The Washington Post's Dan Balz, CBS This Morning co-host Norah O'Donnell and CBS News political director John Dickerson.