Joe Biden tried taking a victory lap this week, celebrating a coveted foreign policy win. Yet in the streets near his house, he was being jeered over a different foreign crisis — the one that's threatening his presidency. A few blocks from the White House, students set up tents, building another impromptu encampment as part of Mideast protests proliferating across the country. This was as Biden was celebrating a hard-fought, long-sought success: the adoption of a foreign-aid law that will arm Ukraine throughout the year. But the continued arms for Israel in that same law stoked the anger of students...