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

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.