Open: This is Face the Nation, March 10

      |Sunday on Face the Nation: Mayor Michael Bloomberg, Sen. Rob Portman, R-Ohio, Rep. Chris Van Hollen, D-Md., and Gov. Jeb Bush, R-Fla. Plus, the latest on politics with John Dickerson, and on the Conclave to elect a new Pope with Carl Bernstein, Peggy Noonan, Sally Quinn and Greg Tobin.

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