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(Reuters) - Pete Buttigieg held on to a narrow lead on Tuesday as Iowa Democrats released additional results from their chaotic caucuses, as former Vice President Joe Biden trailed badly in fourth place with about 71% of precincts reporting.

U.S. Senator Bernie Sanders was a close second and U.S. Senator Elizabeth Warren was third, after a series of technical problems led to delays in counting the votes after Iowans poured into more than 1,600 public locations to begin the five-month process of picking a challenger to Republican President Donald Trump for November’s election.