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ANDOVER, MN- MARCH 1: Republican presidential candidate Sen. Marco Rubio (R-Fla.) speaks to a crowd of supporters Courtyards of Andover Event Center in Andover, MN. Rubio is hoping to win Minnesota in the Super Tuesday primary election. (Photo by Stephen Maturen/Getty Images)
ANDOVER, MN- MARCH 1: Republican presidential candidate Sen. Marco Rubio (R-Fla.) speaks to a crowd of supporters Courtyards of Andover Event Center in Andover, MN. Rubio is hoping to win Minnesota in the Super Tuesday primary election. (Photo by Stephen Maturen/Getty Images)

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Rubio: people forget Trump led in 2012 polling

In an exclusive interview with Jake Tapper, Sen. Marco Rubio explains why he always took Donald Trump's campaign seriously.