Senator Bernie Sanders claimed victory in the Iowa caucuses on Monday, citing internal campaign data that placed him ahead of Pete Buttigieg after a major delay to the release of official results. The first vote of the US election season, Iowa’s caucuses kick off the Democratic primary that will determine who challenges Donald Trump in November. Data released by the Sanders campaign, which said it represents results from nearly 40 percent of precincts in Iowa, shows the leftist senator garnering 28.62 percent of the vote, followed by moderate Buttigieg on 25.71 percent. The data showed progressive Senator Elizabeth Warren in third place, with 18.42 percent of the vote, with former vice president Joe Biden slipping to fourth place on 15.08 percent. Monday’s contest turned sour after major hiccups in the reporting process prevented the release of official results.