Dozens of Muslim delegates and their allies, angry at U.S. support for Israel’s was on Gaza, are seeking changes in the Democratic platform and plan to press for an arms embargo this week, putting the party on guard for disruptions to high-profile speeches at its national convention in Chicago. Calling itself “Delegates Against Genocide,” the pro-Palestinian group says it will exercise its freedom of speech rights during main events at the four-day Democratic National Convention convening on Monday to formally nominate Vice President Kamala Harris for president in the election against Republic…