Coming Up on 'This Week with George Stephanopoulos'

— -- Just one day after the Ames Straw Poll in Iowa, Senator Sam Brownback, R-Kan., joins George to talk about the results, the campaign and his recent attacks on fellow contender Mitt Romney. Will he stay in the race? What are his plans for the future?

Also this week, Rep. Dennis Kucinich, D-Ohio, talks to George about the Democratic field and his longshot campaign for the presidency. What drives him to stay in the race?

George Will, Fareed Zakaria, Torie Clarke and Donna Brazile on our "Roundtable."

And, our "Voice" this week, Leonardo DiCaprio on his new environmental documentary "The 11th Hour."

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