Donald Trump, Hillary Clinton hold slight leads in Iowa poll

Republican presidential hopeful Donald Trump overtook Sen. Ted Cruz (R-Texas) atop the Bloomberg Politics/Des Moines Register poll in Iowa released Saturday. Among likely caucus-goers, Trump notched 28 percent of the vote to Cruz's 23 percent and Sen. Marco Rubio's (R-Fla.) 15 percent.

On the Democratic side, Hillary Clinton is neck-and-neck with Bernie Sanders. They sit at 45 percent and 42 percent, respectively.

The poll, which has a margin of error of 4 percentage points, is the last that will be released ahead of Monday's caucuses.

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