With the Democratic National Convention slated to start days from now in Chicago, many in the party are thrilled to channel a sudden burst of energy surrounding Vice President Kamala Harris — who is already certified as the presidential nominee — and emerge unified in taking a “joyful” fight to Donald Trump in the general election. But it won’t be that easy. The ongoing carnage of Israel’s war in Gaza and the threat of a widening war throughout the Middle East raises a profound note of discord amid what party leaders want to be a harmonious gathering. Protest against the Biden-Harris administr…