In the past few weeks, activists in Michigan have begun calling voters in the state, asking them to protest President Biden’s support for the Israeli military campaign in Gaza by not voting for him in the Democratic primary. The activists are attempting to turn their anger over Gaza into a political force, one that could be decisive in a critical swing state where winning in November is likely to be a matter of the slimmest of margins. Jennifer Medina, a political reporter for The Times, explains how the war in Gaza is changing politics in Michigan.