Michigan primary a test for Biden as key voters turn away over Gaza war

Biden faces campaign by anti-war activists to abandon him, while Trump faces local leaders embroiled in a factional dispute

• What to know about Michigan's primary election

Polls began to close in Michigan on Tuesday, in a presidential primary that tested how much Joe Biden and Donald Trump should be worried about winning key groups of voters in the general election in the critical swing state.

Though both were on track to win their races, Biden and Trump faced challenges within their respective parties. After underperforming in the polls and struggling with suburban and college-educated Republican voters in earlier primaries, Trump's campaign in Michigan is dealing with a state Republican party whose local leaders have been embroiled in an ugly factional dispute, while Biden faces a campaign by anti-war activists to abandon him over the president's continued support for Israel's military campaign in Gaza.