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JOHNSTON, IA - JANUARY 31: Democratic Presidential Candidate Martin O'Malley speaks to potential supporters at a residence on January 31, 2016 in Johnston, Iowa. O'Malley and other candidates are making their final appeals to voters ahead of the Iowa caucus February 1. (Photo by Steve Pope/Getty Images)
JOHNSTON, IA - JANUARY 31: Democratic Presidential Candidate Martin O'Malley speaks to potential supporters at a residence on January 31, 2016 in Johnston, Iowa. O'Malley and other candidates are making their final appeals to voters ahead of the Iowa caucus February 1. (Photo by Steve Pope/Getty Images)

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    Could O'Malley decide the Democratic race?

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Could O'Malley decide the Democratic race?

Martin O'Malley may be running third in the polls, but his supporters will be asked to pick a 2nd and 3rd choice which will affect Hillary Clinton and Bernie Sanders. CNN's Jeff Zeleny reports.

Could O'Malley decide the Democratic race?

Martin O'Malley may be running third in the polls, but his supporters will be asked to pick a 2nd and 3rd choice which will affect Hillary Clinton and Bernie Sanders. CNN's Jeff Zeleny reports.