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Republican presidential candidates Donald Trump, left, and Sen. Ted Cruz interact at the conclusion of the CNN Republican presidential debate at The Venetian Las Vegas on December 15, 2015.
Republican presidential candidates Donald Trump, left, and Sen. Ted Cruz interact at the conclusion of the CNN Republican presidential debate at The Venetian Las Vegas on December 15, 2015.

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    Is Trump's "birther" attack hurting Cruz in Iowa?

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Is Trump's "birther" attack hurting Cruz in Iowa?

Phil Musser, former adviser to Mitt Romney's presidential campaign, says if turnout in Iowa remains low again, the number of voters bothered by Cruz being born in Canada could be "a big deal."

Is Trump's "birther" attack hurting Cruz in Iowa?

Phil Musser, former adviser to Mitt Romney's presidential campaign, says if turnout in Iowa remains low again, the number of voters bothered by Cruz being born in Canada could be "a big deal."