Donald Trump has his sights on a historic caucus win as thousands brave sub-zero temperatures to vote in the first contest of the Republican race.Voters have ignored frostbite warnings and wind chills of minus 30 degrees to stream into 1,657 precincts across the state to pick who they want on the ticket in the 2024 general election.The frontrunner is heading for a blowout victory, leading by a dominant 28 points in the most recent poll in the Hawkeye State.
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