Story highlights The results were released just two days before Iowa voters begin caucusing

J. Ann Selzer, whose Selzer & Company conducts the Iowa Poll, was the only pollster to accurately predict the 2004 Democratic caucus order

Washington (CNN) Donald Trump has a five-point lead on Texas Sen. Ted Cruz in what is likely to be the final major poll before the Iowa caucuses, while Hillary Clinton and Bernie Sanders are virtually tied.

The Des Moines Register/Bloomberg Politics Iowa Poll gives the billionaire businessman 28% of likely GOP caucus-goers, with Cruz at 23%. Sen. Marco Rubio of Florida trails at 15%, with Ben Carson further back at 10%.

The margin of error for results on both sides is 4 percentage points.

This is the first time Trump, the nationwide GOP front-runner, has held a lead in a Bloomberg Politics/Register poll. In other recent Iowa surveys, he has been above 30%. For Cruz, however, the poll is down a bit from where he stood in most December and early January polling.

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