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Wisconsin Gov. Scott Walker discusses his potential 2016 GOP presidential bid, only on "This Week" Sunday.

And the powerhouse roundtable debates all the week's politics, with ABC News political analyst Matthew Dowd, ESPN columnist and CNN contributor LZ Granderson, PBS "NewsHour" co-host and managing editor Gwen Ifill, and National Review editor Rich Lowry.

See the whole political picture, Sunday on "This Week."

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