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LAS VEGAS, NV - FEBRUARY 23:  Donald Trump Jr. (L) looks on as his father, Republican presidential candidate Donald Trump, waves after speaking at a caucus night watch party at the Treasure Island Hotel & Casino on February 23, 2016 in Las Vegas, Nevada. The New York businessman won his third state victory in a row in the "first in the West" caucuses.  (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - FEBRUARY 23:  Donald Trump Jr. (L) looks on as his father, Republican presidential candidate Donald Trump, waves after speaking at a caucus night watch party at the Treasure Island Hotel & Casino on February 23, 2016 in Las Vegas, Nevada. The New York businessman won his third state victory in a row in the "first in the West" caucuses.  (Photo by Ethan Miller/Getty Images)

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King: For those who say Trump cannot win, you're wrong.

CNN chief national correspondent John King discusses Trump's brand and how it's helped him win three early contests in a row.

King: For those who say Trump cannot win, you're wrong.

CNN chief national correspondent John King discusses Trump's brand and how it's helped him win three early contests in a row.