Joe Biden has won the Democratic presidential primary in Michigan, despite a significant protest over his policy towards the war in Gaza. The US president faced no real challenger in the contest, likely winning 80% of the vote overall. But his support was hit by a recent campaign urging Democrats to vote “uncommitted”, amid anger and betrayal some Arab American and younger voters in the state feel for Biden. Their number could single weakness for Biden, who can hardly afford to lose such support with elections due in November. As of Tuesday night, “uncommitted” had received 74,000 votes out of…